diff --git a/application/controllers/Api.php b/application/controllers/Api.php
index 5d4cba02e..01a1b28bf 100644
--- a/application/controllers/Api.php
+++ b/application/controllers/Api.php
@@ -620,7 +620,7 @@ class API extends CI_Controller {
 					// Get associated station locations for mysql queries
 					$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($logbook_id);
 
-					if (!$logbooks_locations_array) {
+					if ($logbooks_locations_array[0] === -1) {
 						// Logbook not found
 						http_response_code(404);
 						echo json_encode(['status' => 'failed', 'reason' => "Empty Logbook"]);
@@ -706,7 +706,7 @@ class API extends CI_Controller {
 					// Get associated station locations for mysql queries
 					$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($logbook_id);
 
-					if (!$logbooks_locations_array) {
+					if ($logbooks_locations_array[0] === -1) {
 						// Logbook not found
 						http_response_code(404);
 						echo json_encode(['status' => 'failed', 'reason' => "Empty Logbook"]);
@@ -750,7 +750,7 @@ class API extends CI_Controller {
 
 	}
 
-	// API function to check if a grid is in the logbook already
+	// API function to get all worked grids for a band and confirmation method
 	function logbook_get_worked_grids() {
 		$arr = array();
 		header('Content-type: application/json');
@@ -795,7 +795,7 @@ class API extends CI_Controller {
 			}
 			if ($this->logbooks_model->exists_logbook_id($logbook_id) != false) {
 				$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($logbook_id);
-				if ($logbooks_locations_array[0] == -1) {
+				if ($logbooks_locations_array[0] === -1) {
 					http_response_code(404);
 					echo json_encode(['status' => 'failed', 'reason' => "logbook with ID ".$logbook_id." has no associated station locations"]);
 					die();
diff --git a/application/controllers/Awards.php b/application/controllers/Awards.php
index 8898bcc9b..aa98c7e73 100644
--- a/application/controllers/Awards.php
+++ b/application/controllers/Awards.php
@@ -925,7 +925,7 @@ class Awards extends CI_Controller {
 
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -1889,7 +1889,7 @@ class Awards extends CI_Controller {
 	    $this->load->model('logbooks_model');
 	    $logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-	    if (!$logbooks_locations_array) {
+	    if ($logbooks_locations_array[0] === -1) {
 		    return null;
 	    }
 
diff --git a/application/controllers/Dashboard.php b/application/controllers/Dashboard.php
index c16f61060..ba7da5d26 100644
--- a/application/controllers/Dashboard.php
+++ b/application/controllers/Dashboard.php
@@ -34,7 +34,7 @@ class Dashboard extends CI_Controller {
 			$data['active_not_linked']=false;
 		}
 
-		if ($logbooks_locations_array[0] == -1) {
+		if ($logbooks_locations_array[0] === -1) {
 			$data['linkedCount']=0;
 		} else {
 			$data['linkedCount']=sizeof($logbooks_locations_array);
diff --git a/application/controllers/Logbook.php b/application/controllers/Logbook.php
index 1a650805f..7b0c2a316 100644
--- a/application/controllers/Logbook.php
+++ b/application/controllers/Logbook.php
@@ -262,7 +262,7 @@ class Logbook extends CI_Controller {
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 		$user_default_confirmation = $this->session->userdata('user_default_confirmation');
 
-		if(!empty($logbooks_locations_array)) {
+		if($logbooks_locations_array[0] !== -1) {
 			$extrawhere='';
 			if (isset($user_default_confirmation) && strpos($user_default_confirmation, 'Q') !== false) {
 				$extrawhere="COL_QSL_RCVD='Y'";
@@ -337,7 +337,7 @@ class Logbook extends CI_Controller {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if(!empty($logbooks_locations_array)) {
+		if($logbooks_locations_array[0] !== -1) {
 			if($band == "SAT") {
 				$this->db->where('COL_PROP_MODE', 'SAT');
 			} else {
@@ -475,7 +475,7 @@ class Logbook extends CI_Controller {
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 		$this->load->model('logbook_model');
 
-		if(!empty($logbooks_locations_array)) {
+		if($logbooks_locations_array[0] !== -1) {
 			if($type == "SAT") {
 				$this->db->where('COL_PROP_MODE', 'SAT');
 			} else {
@@ -579,7 +579,7 @@ class Logbook extends CI_Controller {
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 		$this->load->model('logbook_model');
 
-		if(!empty($logbooks_locations_array)) {
+		if($logbooks_locations_array[0] !== -1) {
 			if($type == "SAT") {
 				$this->db->where('COL_PROP_MODE', 'SAT');
 			} else {
@@ -717,7 +717,7 @@ class Logbook extends CI_Controller {
 			$satellites[$sat->name] = $sat->displayname;
 		}
 
-		if(!empty($logbooks_locations_array)) {
+		if($logbooks_locations_array[0] !== -1) {
 			$station_ids = implode(',', array_map(function($id) { return (int)$id; }, $logbooks_locations_array));
 
 			$bindings = [
diff --git a/application/controllers/Oqrs.php b/application/controllers/Oqrs.php
index 70a532626..91004f9d8 100644
--- a/application/controllers/Oqrs.php
+++ b/application/controllers/Oqrs.php
@@ -167,11 +167,11 @@ class Oqrs extends CI_Controller {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-        if ($logbooks_locations_array) {
+		if ($logbooks_locations_array[0] !== -1) {
 			$location_list = "'".implode("','",$logbooks_locations_array)."'";
 		} else {
-            $location_list = null;
-        }
+			$location_list = null;
+		}
 
 		$this->load->model('oqrs_model');
 		$data['result'] = $this->oqrs_model->getOqrsRequests($location_list);
diff --git a/application/controllers/Visitor.php b/application/controllers/Visitor.php
index bde637c96..e4b603fe7 100644
--- a/application/controllers/Visitor.php
+++ b/application/controllers/Visitor.php
@@ -72,7 +72,7 @@ class Visitor extends CI_Controller {
                     // Get associated station locations for mysql queries
                     $logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($logbook_id);
 
-					if (!$logbooks_locations_array) {
+					if ($logbooks_locations_array[0] === -1) {
 						show_404(__("Empty Logbook"));
 					}
 
@@ -167,7 +167,7 @@ class Visitor extends CI_Controller {
             // Get associated station locations for mysql queries
             $logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($logbook_id);
 
-			if (!$logbooks_locations_array) {
+			if ($logbooks_locations_array[0] === -1) {
 				show_404(__("Empty Logbook"));
 			}
         } else {
@@ -202,7 +202,7 @@ class Visitor extends CI_Controller {
 				// Get associated station locations for mysql queries
 				$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($logbook_id);
 
-				if (!$logbooks_locations_array) {
+				if ($logbooks_locations_array[0] === -1) {
 					show_404(__("Empty Logbook"));
 				}
 			} else {
@@ -470,7 +470,7 @@ class Visitor extends CI_Controller {
             // Get associated station locations for mysql queries
             $logbooks_locations_array = $this->stationsetup_model->get_container_relations($logbook_id);
 
-			if (!$logbooks_locations_array) {
+			if ($logbooks_locations_array[0] === -1) {
 				show_404(__("Empty Logbook"));
 			}
         } else {
diff --git a/application/controllers/Widgets.php b/application/controllers/Widgets.php
index 3c4cbeae2..5002d2915 100644
--- a/application/controllers/Widgets.php
+++ b/application/controllers/Widgets.php
@@ -60,7 +60,7 @@ class Widgets extends CI_Controller {
 				// Get associated station locations for mysql queries
 				$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($logbook_id);
 
-				if (!$logbooks_locations_array) {
+				if ($logbooks_locations_array[0] === -1) {
 					show_404(__("Empty Logbook"));
 				}
 			} else {
diff --git a/application/libraries/DxclusterCache.php b/application/libraries/DxclusterCache.php
index 1a3bd2a73..225da3d2c 100644
--- a/application/libraries/DxclusterCache.php
+++ b/application/libraries/DxclusterCache.php
@@ -105,7 +105,7 @@ class DxclusterCache {
 		$logbook_ids = $this->CI->logbooks_model->list_logbook_relationships($active_logbook);
 		$confirmation_prefs = $this->CI->session->userdata('user_default_confirmation') ?? '';
 
-		if (empty($logbook_ids)) return null;
+		if ($logbook_ids[0] === -1) return null;
 
 		return $this->get_logbook_key($user_id, $logbook_ids, $confirmation_prefs);
 	}
diff --git a/application/models/Accumulate_model.php b/application/models/Accumulate_model.php
index 29742245d..c1248db87 100644
--- a/application/models/Accumulate_model.php
+++ b/application/models/Accumulate_model.php
@@ -7,7 +7,7 @@ class Accumulate_model extends CI_Model
         $this->load->model('logbooks_model');
         $logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-        if (!$logbooks_locations_array) {
+        if ($logbooks_locations_array[0] === -1) {
             return array();
         }
 
diff --git a/application/models/Activated_gridmap_model.php b/application/models/Activated_gridmap_model.php
index 73b3c3178..6c6fbe76d 100644
--- a/application/models/Activated_gridmap_model.php
+++ b/application/models/Activated_gridmap_model.php
@@ -7,7 +7,7 @@ class Activated_gridmap_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -59,7 +59,7 @@ class Activated_gridmap_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -110,7 +110,7 @@ class Activated_gridmap_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -163,7 +163,7 @@ class Activated_gridmap_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -256,7 +256,7 @@ class Activated_gridmap_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/models/Activators_model.php b/application/models/Activators_model.php
index df1958c0d..626c82ef9 100644
--- a/application/models/Activators_model.php
+++ b/application/models/Activators_model.php
@@ -12,7 +12,7 @@ class Activators_model extends CI_Model
 			$mincount = 2;
 		}
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -119,7 +119,7 @@ class Activators_model extends CI_Model
       $this->load->model('logbooks_model');
       $logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-      if (!$logbooks_locations_array) {
+      if ($logbooks_locations_array[0] === -1) {
          return array();
       }
 
diff --git a/application/models/Counties.php b/application/models/Counties.php
index 55a5a8f7b..924dd5089 100644
--- a/application/models/Counties.php
+++ b/application/models/Counties.php
@@ -27,7 +27,7 @@ class Counties extends CI_Model
 		$CI->load->model('logbooks_model');
 		$logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-        if (!$logbooks_locations_array) {
+        if ($logbooks_locations_array[0] === -1) {
             return null;
         }
 
@@ -87,7 +87,7 @@ class Counties extends CI_Model
 		$CI->load->model('logbooks_model');
 		$logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-        if (!$logbooks_locations_array) {
+        if ($logbooks_locations_array[0] === -1) {
             return null;
         }
 
diff --git a/application/models/Dayswithqso_model.php b/application/models/Dayswithqso_model.php
index 98b10bc3d..58978bb7f 100644
--- a/application/models/Dayswithqso_model.php
+++ b/application/models/Dayswithqso_model.php
@@ -8,7 +8,7 @@ class Dayswithqso_model extends CI_Model
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-        if (!$logbooks_locations_array) {
+        if ($logbooks_locations_array[0] === -1) {
             return null;
         }
 
@@ -167,7 +167,7 @@ class Dayswithqso_model extends CI_Model
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-        if (!$logbooks_locations_array) {
+        if ($logbooks_locations_array[0] === -1) {
             return null;
         }
 
@@ -186,7 +186,7 @@ class Dayswithqso_model extends CI_Model
 	    $this->load->model('logbooks_model');
 	    $logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-	    if (!$logbooks_locations_array) {
+	    if ($logbooks_locations_array[0] === -1) {
 		    return null;
 	    }
 
@@ -211,7 +211,7 @@ class Dayswithqso_model extends CI_Model
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-        if (!$logbooks_locations_array) {
+        if ($logbooks_locations_array[0] === -1) {
             return null;
         }
 
@@ -233,7 +233,7 @@ class Dayswithqso_model extends CI_Model
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-        if (!$logbooks_locations_array) {
+        if ($logbooks_locations_array[0] === -1) {
             return null;
         }
 
diff --git a/application/models/Distancerecords_model.php b/application/models/Distancerecords_model.php
index 2f7c14e06..38269616e 100644
--- a/application/models/Distancerecords_model.php
+++ b/application/models/Distancerecords_model.php
@@ -17,7 +17,7 @@ class Distancerecords_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 		$sql = 'SELECT t1.sat, displayname AS sat_displayname, t1.distance, t2.COL_TIME_ON AS time, t2.COL_CALL AS callsign, t2.COL_GRIDSQUARE AS grid, t2.COL_MODE AS mode, t2.COL_PRIMARY_KEY AS primarykey, t2.station_gridsquare AS mygrid
@@ -51,7 +51,7 @@ class Distancerecords_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 		// First get max distance per sat
diff --git a/application/models/Distances_model.php b/application/models/Distances_model.php
index 8c6b12e3f..3c9a66f5c 100644
--- a/application/models/Distances_model.php
+++ b/application/models/Distances_model.php
@@ -11,7 +11,7 @@ class Distances_model extends CI_Model
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			header('Content-Type: application/json');
 			echo json_encode(array('Error' => 'No QSOs found to plot.'));
 			return;
diff --git a/application/models/Eqsl_images.php b/application/models/Eqsl_images.php
index e2c2d91b5..7633db583 100644
--- a/application/models/Eqsl_images.php
+++ b/application/models/Eqsl_images.php
@@ -44,6 +44,9 @@ class Eqsl_images extends CI_Model {
 	function count_eqsl_qso_list() {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
+		if ($logbooks_locations_array[0] === -1) {
+			return;
+		}
 		$this->db->join($this->config->item('table_name'), 'qso_id = COL_PRIMARY_KEY', 'left outer');
 		$this->db->join('station_profile', $this->config->item('table_name').'.station_id = station_profile.station_id', 'left outer');
 		$this->db->where_in('station_profile.station_id', $logbooks_locations_array);
@@ -53,6 +56,9 @@ class Eqsl_images extends CI_Model {
 	function eqsl_qso_list($limit = null, $offset = null) {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
+		if ($logbooks_locations_array[0] === -1) {
+			return;
+		}
 		$this->db->select('COL_PRIMARY_KEY, qso_id, COL_CALL, COL_MODE, COL_SUBMODE, COL_TIME_ON, COL_BAND, COL_PROP_MODE, COL_SAT_NAME, COL_QSLMSG_RCVD, COL_EQSL_QSLRDATE, image_file');
 		$this->db->join($this->config->item('table_name'), 'qso_id = COL_PRIMARY_KEY', 'left outer');
 		$this->db->join('station_profile', $this->config->item('table_name').'.station_id = station_profile.station_id', 'left outer');
diff --git a/application/models/Gridmap_model.php b/application/models/Gridmap_model.php
index 5eecaf583..c4689afe1 100644
--- a/application/models/Gridmap_model.php
+++ b/application/models/Gridmap_model.php
@@ -8,7 +8,7 @@ class Gridmap_model extends CI_Model {
 			$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 		}
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
         }
 
@@ -95,7 +95,7 @@ class Gridmap_model extends CI_Model {
 			$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 		}
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
         }
 
@@ -178,7 +178,7 @@ class Gridmap_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -255,7 +255,7 @@ class Gridmap_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -368,7 +368,7 @@ class Gridmap_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/models/Helvetia_model.php b/application/models/Helvetia_model.php
index 8e88f35a2..384feceee 100644
--- a/application/models/Helvetia_model.php
+++ b/application/models/Helvetia_model.php
@@ -12,7 +12,7 @@ class helvetia_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -89,7 +89,7 @@ class helvetia_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/models/Logbook_model.php b/application/models/Logbook_model.php
index 5fc9befc5..3e2de813c 100644
--- a/application/models/Logbook_model.php
+++ b/application/models/Logbook_model.php
@@ -3314,7 +3314,7 @@ class Logbook_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -3333,7 +3333,7 @@ class Logbook_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -3465,7 +3465,7 @@ class Logbook_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -3629,7 +3629,7 @@ class Logbook_model extends CI_Model {
 			$logbooks_locations_array = $StationLocationsArray;
 		}
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return [
 				'total' => 0,
 				'today' => 0,
@@ -3694,7 +3694,7 @@ class Logbook_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 		$mode[] = 'SSB';
@@ -3720,7 +3720,7 @@ class Logbook_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -3743,7 +3743,7 @@ class Logbook_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -3782,7 +3782,7 @@ class Logbook_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -3805,7 +3805,7 @@ class Logbook_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -3827,7 +3827,7 @@ class Logbook_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -3850,7 +3850,7 @@ class Logbook_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -3877,7 +3877,7 @@ class Logbook_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -3899,7 +3899,7 @@ class Logbook_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/models/Pota.php b/application/models/Pota.php
index b7b0c51e1..a4f453ab9 100644
--- a/application/models/Pota.php
+++ b/application/models/Pota.php
@@ -6,7 +6,7 @@ class Pota extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/models/Qsl_model.php b/application/models/Qsl_model.php
index 22f2fa789..77b9c964f 100644
--- a/application/models/Qsl_model.php
+++ b/application/models/Qsl_model.php
@@ -183,7 +183,7 @@ class Qsl_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/models/Rac.php b/application/models/Rac.php
index 94964e7e9..a63c649d2 100644
--- a/application/models/Rac.php
+++ b/application/models/Rac.php
@@ -12,7 +12,7 @@ class rac extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -89,7 +89,7 @@ class rac extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/models/Satellite_model.php b/application/models/Satellite_model.php
index 062829d84..86ad3ca83 100644
--- a/application/models/Satellite_model.php
+++ b/application/models/Satellite_model.php
@@ -42,6 +42,9 @@ class Satellite_model extends CI_Model {
 	function get_last_worked_sat() {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
+		if ($logbooks_locations_array[0] === -1) {
+			return null;
+		}
 		$location_list = "'" . implode("','", $logbooks_locations_array) . "'";
 		$sql = "select COL_SAT_NAME as sat from " . $this->config->item('table_name') .
 			" where station_id in (" . $location_list . ")" .
diff --git a/application/models/Seven3on73.php b/application/models/Seven3on73.php
index e16600945..f62aceb1c 100644
--- a/application/models/Seven3on73.php
+++ b/application/models/Seven3on73.php
@@ -6,7 +6,7 @@ class Seven3on73 extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/models/Sig.php b/application/models/Sig.php
index ba94f0f83..15b2737bc 100644
--- a/application/models/Sig.php
+++ b/application/models/Sig.php
@@ -7,7 +7,7 @@ class Sig extends CI_Model {
 		$CI->load->model('logbooks_model');
 		$logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
             return null;
         }
 
@@ -28,7 +28,7 @@ class Sig extends CI_Model {
 		$CI->load->model('logbooks_model');
 		$logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
             return null;
         }
 
diff --git a/application/models/Sota.php b/application/models/Sota.php
index dbd4fc9b0..3d4a3910d 100644
--- a/application/models/Sota.php
+++ b/application/models/Sota.php
@@ -6,7 +6,7 @@ class Sota extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/models/Stats.php b/application/models/Stats.php
index c086f8c93..1d304ead1 100644
--- a/application/models/Stats.php
+++ b/application/models/Stats.php
@@ -238,7 +238,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -299,7 +299,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 		  return null;
 		}
 
@@ -322,7 +322,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -383,7 +383,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 		  return null;
 		}
 
@@ -405,7 +405,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 		  return null;
 		}
 
@@ -425,7 +425,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 		  return null;
 		}
 
@@ -445,7 +445,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 		  return null;
 		}
 
@@ -467,7 +467,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 		  return null;
 		}
 
@@ -489,7 +489,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 		  return null;
 		}
 
@@ -509,7 +509,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -549,7 +549,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 		  return null;
 		}
 
@@ -570,7 +570,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 		  return null;
 		}
 
@@ -744,7 +744,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 		$binding=[];
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -776,7 +776,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 		$binding=[];
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -809,7 +809,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -831,7 +831,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -849,7 +849,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -874,7 +874,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -910,7 +910,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -940,7 +940,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -971,7 +971,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -1018,7 +1018,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -1101,7 +1101,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -1135,7 +1135,7 @@
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/models/Timeline_model.php b/application/models/Timeline_model.php
index f23a231d1..e53ef7529 100644
--- a/application/models/Timeline_model.php
+++ b/application/models/Timeline_model.php
@@ -6,7 +6,7 @@ class Timeline_model extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/models/Timeplotter_model.php b/application/models/Timeplotter_model.php
index cd26147af..5080b6d0d 100644
--- a/application/models/Timeplotter_model.php
+++ b/application/models/Timeplotter_model.php
@@ -9,7 +9,7 @@ class Timeplotter_model extends CI_Model
 		$CI->load->model('logbooks_model');
 		$logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-        if (!$logbooks_locations_array) {
+        if ($logbooks_locations_array[0] === -1) {
             header('Content-Type: application/json');
             $data['error'] = 'No QSOs found to plot!';
             echo json_encode($data);
diff --git a/application/models/Wae.php b/application/models/Wae.php
index cfb34228f..a86390c15 100644
--- a/application/models/Wae.php
+++ b/application/models/Wae.php
@@ -34,7 +34,7 @@ class WAE extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if ($logbooks_locations_array) {
+		if ($logbooks_locations_array[0] !== -1) {
 			// Create the location_list string
 			$this->location_list = "'" . implode("','", $logbooks_locations_array) . "'";
 		} else {
diff --git a/application/models/Wap.php b/application/models/Wap.php
index b2304c762..20027f073 100644
--- a/application/models/Wap.php
+++ b/application/models/Wap.php
@@ -14,7 +14,7 @@ class wap extends CI_Model {
 		$CI->load->model('logbooks_model');
 		$logbooks_locations_array = $CI->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -91,7 +91,7 @@ class wap extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/models/Was.php b/application/models/Was.php
index 7a868f6cd..c700b0ba5 100644
--- a/application/models/Was.php
+++ b/application/models/Was.php
@@ -11,7 +11,7 @@ class was extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
@@ -90,7 +90,7 @@ class was extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/models/Wpx.php b/application/models/Wpx.php
index cd8d27523..32da1014d 100644
--- a/application/models/Wpx.php
+++ b/application/models/Wpx.php
@@ -12,7 +12,7 @@ class WPX extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 		$this->load->model('bands');
@@ -335,7 +335,7 @@ class WPX extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 		$location_list = "'".implode("','",$logbooks_locations_array)."'";
diff --git a/application/models/Wwff.php b/application/models/Wwff.php
index a17b70a48..89168be5b 100644
--- a/application/models/Wwff.php
+++ b/application/models/Wwff.php
@@ -6,7 +6,7 @@ class Wwff extends CI_Model {
 		$this->load->model('logbooks_model');
 		$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
 
-		if (!$logbooks_locations_array) {
+		if ($logbooks_locations_array[0] === -1) {
 			return null;
 		}
 
diff --git a/application/views/interface_assets/header.php b/application/views/interface_assets/header.php
index 407c36e8b..a47cb7027 100644
--- a/application/views/interface_assets/header.php
+++ b/application/views/interface_assets/header.php
@@ -494,7 +494,7 @@
 
 								<?php
 								$logbooks_locations_array = $this->logbooks_model->list_logbook_relationships($this->session->userdata('active_station_logbook'));
-								if ($logbooks_locations_array) {
+								if ($logbooks_locations_array[0] !== -1) {
 									$location_list = "'" . implode("','", $logbooks_locations_array) . "'";
 								} else {
 									$location_list = null;