Fatal error: Uncaught Doctrine\ORM\ORMInvalidArgumentException: EntityManager#detach() expects parameter 1 to be an entity object, NULL given. in /var/www/vhosts/neusatzverlag.de/vendor/doctrine/orm/lib/Doctrine/ORM/ORMInvalidArgumentException.php:189 Stack trace: #0 /var/www/vhosts/neusatzverlag.de/vendor/doctrine/orm/lib/Doctrine/ORM/EntityManager.php(656): Doctrine\ORM\ORMInvalidArgumentException::invalidObject('EntityManager#d...', NULL) #1 /var/www/vhosts/neusatzverlag.de/engine/Shopware/Controllers/Frontend/Forms.php(161): Doctrine\ORM\EntityManager->detach(NULL) #2 /var/www/vhosts/neusatzverlag.de/engine/Shopware/Controllers/Frontend/Forms.php(73): Shopware_Controllers_Frontend_Forms->getContent('16') #3 /var/www/vhosts/neusatzverlag.de/engine/Library/Enlight/Controller/Action.php(192): Shopware_Controllers_Frontend_Forms->indexAction() #4 /var/www/vhosts/neusatzverlag.de/engine/Library/Enlight/Controller/Dispatcher/Default.php(478): Enlight_Controller_Action->dispatch('indexAction') #5 /var/www/vhosts/neusatzverla in /var/www/vhosts/neusatzverlag.de/vendor/doctrine/orm/lib/Doctrine/ORM/ORMInvalidArgumentException.php on line 189