diff --git a/application/migrations/179_remove_dupidx_lotw.php b/application/migrations/179_remove_dupidx_lotw.php
index 5f575fc2d..1b98759af 100644
--- a/application/migrations/179_remove_dupidx_lotw.php
+++ b/application/migrations/179_remove_dupidx_lotw.php
@@ -5,10 +5,16 @@ defined('BASEPATH') OR exit('No direct script access allowed');
 class Migration_remove_dupidx_lotw extends CI_Migration {
 
 	public function up() {
-		$this->db->query("ALTER TABLE lotw_users DROP INDEX id");
+		$prefixes_index = $this->db->query("SHOW INDEX FROM lotw_users WHERE Key_name = 'id'")->num_rows();
+		if ($prefixes_index == 1) {
+			$this->db->query("ALTER TABLE lotw_users DROP INDEX id");
+		}
 	}
 
 	public function down(){
-		$this->db->query("ALTER TABLE lotw_users ADD UNIQUE INDEX id (id)");
+		$prefixes_index = $this->db->query("SHOW INDEX FROM lotw_users WHERE Key_name = 'id'")->num_rows();
+		if ($prefixes_index == 0) {
+			$this->db->query("ALTER TABLE lotw_users ADD UNIQUE INDEX id (id)");
+		}
 	}
 }