okay

laravel_app/app/Listeners/UpdateMailingStatus.php

@@ -22,7 +22,9 @@ public function __construct()
      */
     public function handle(MessageSent $event): void
     {
-        ProjectMailing::where('id', $event->data['mailing']['id'])
-            ->update(['status' => 'success']);
+        if (array_key_exists('mailing' ,$event->data)) {
+            ProjectMailing::where('id', $event->data['mailing']['id'])
+                ->update(['status' => 'success']);
+        }
     }
 }