Fatal error: Uncaught Symfony\Component\Debug\Exception\FatalThrowableError: Call to a member function getType() on null in /var/www/html/src/AppBundle/Controller/DefaultController.php:47 Stack trace: #0 /var/www/html/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php(151): AppBundle\Controller\DefaultController->categoryAction(Object(Symfony\Component\HttpFoundation\Request), 'ghiduri', '319') #1 /var/www/html/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/HttpKernel.php(68): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #2 /var/www/html/vendor/symfony/symfony/src/Symfony/Component/HttpKernel/Kernel.php(169): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #3 /var/www/html/web/app.php(19): Symfony\Component\HttpKernel\Kernel->handle(Object(Symfony\Component\HttpFoundation\Request)) #4 {main} Next Twig_Error_Runtime: The merge filter only works with arrays or "Traversable", got in /var/www/html/app/Resources/TwigBundle/views/Exception/error.html.twig on line 1