diff --git a/application/controllers/Cron.php b/application/controllers/Cron.php
index 2c3dd4d9d..f7a3c5a18 100644
--- a/application/controllers/Cron.php
+++ b/application/controllers/Cron.php
@@ -51,8 +51,12 @@ class cron extends CI_Controller {
 			if ($cron->enabled == 1) {
 
 				// calculate the crons expression
-				$this->load->library('CronExpression');
-				$cronjob = CronExpression::parse($cron->expression); // Verwende die statische Methode der CronExpression-Klasse
+				$data = array(
+					'expression' => $cron->expression,
+					'timeZone' => null
+				);
+				$this->load->library('CronExpression', $data);
+				$cronjob = $this->cronexpression;
 				$dt = new DateTime();
 				$isdue = $cronjob->isMatching($dt);
 
@@ -101,6 +105,7 @@ class cron extends CI_Controller {
 				// Set the next_run timestamp to null to indicate in the view/database that this cron is disabled
 				$this->cron_model->set_next_run($cron->id, null);
 			}
+			$this->cronexpression = null;
 		}
 	}
 }
diff --git a/application/libraries/CronExpression.php b/application/libraries/CronExpression.php
index 13d56f7a9..439f74883 100644
--- a/application/libraries/CronExpression.php
+++ b/application/libraries/CronExpression.php
@@ -86,14 +86,14 @@ class CronExpression {
 
     /**
      * @param string $expression a cron expression, e.g. "* * * * *"
-     * @param DateTimeZone|null $timeZone time zone object
+     * @param DateTimeZone|null $timeZone time zone objectstring $expression, DateTimeZone $timeZone = null
      */
-    public function __construct(string $expression, DateTimeZone $timeZone = null) {
-        $this->timeZone = $timeZone;
-        $this->expression = $expression;
+    public function __construct($data) {
+        $this->timeZone = $data['timeZone'];
+        $this->expression = $data['expression'];
 
         try {
-            $this->registers = $this->parse($expression);
+            $this->registers = $this->parse($data['expression']);
         } catch (Exception $e) {
             $this->registers = null;
         }