Error when saving Entity without Listener

[avolutions]

I receive an error if I call Entity-save() for an Entity where no Listener exists:

Fatal error: Uncaught Error: Class "Application\Listener\UserListener" not found in \src\Event\EventDispatcher.php:38 Stack trace: #0 \src\Orm\Entity.php(107): Avolutions\Event\EventDispatcher::dispatch(Object(Avolutions\Event\EntityEvent)) #1 \application\Controller\DefaultController.php(16): Avolutions\Orm\Entity->save() #2 [internal function]: Application\Controller\DefaultController->indexAction('1') #3 \src\Http\Request.php(90): call_user_func_array(Array, Array) #4 \public\index.php(33): Avolutions\Http\Request->send() #5 {main} thrown in \src\Event\EventDispatcher.php on line 38