fix api

app/Http/Controllers/MobileApiController.php

@@ -49,6 +49,10 @@ class MobileApiController extends Controller
                 ];
             }
         }
+
+        if (empty($data)) {
+            $data = (object) [];
+        }
         return response()->json($data);
     }
 
@@ -216,6 +220,9 @@ class MobileApiController extends Controller
             ];
         }
 
+        if (empty($availableMarks)) {
+            $availableMarks = (object) [];
+        }
         return response()->json($availableMarks);
     }