symfony - Symfony2 error 500 instead of 404 at production

Question

In my Symfony2 project I'm getting at development mode correct 404 Exception screen. But I'm getting blank screen with HTTP status code 500 instead of 404 at production mode. I'm using custom error templates located in app/Resources/TwigBundle/views/Exception. In apache error log it creates this message:

PHP Fatal error:  Uncaught exception 'Symfony\Component\Routing\Exception\ResourceNotFoundException' in /home/test/app/cache/prod/appprodUrlMatcher.php:518
Stack trace:
#0 /home/test/app/cache/prod/classes.php(1025): appprodUrlMatcher->match('/404')
#1 /home/test/app/cache/prod/classes.php(4550): Symfony\Component\Routing\Router->match('/404')
#2 [internal function]: Symfony\Bundle\FrameworkBundle\EventListener\RouterListener->onKernelRequest(Object(Symfony\Component\HttpKernel\Event\GetResponseEvent))
#3 /home/test/app/cache/prod/classes.php(3777): call_user_func(Array, Object(Symfony\Component\HttpKernel\Event\GetResponseEvent))
#4 /home/test/app/cache/prod/classes.php(3703): Symfony\Component\EventDispatcher\EventDispatcher->doDispatch(Array, 'kernel.request', Object(Symfony\Component\HttpKernel\Event\GetResponseEvent))
#5 /home/test/app/cache/prod/classes.php(4787): Symfony\Component\EventDispatcher\EventDispatcher->dispatch('kernel.request', Object(Symfony\Component\HttpKernel\Event\Get in /home/test/app/cache/prod/classes.php on line 4560

Answer 1

SymfonyComponentRoutingExceptionResourceNotFoundException means undefined route name. It looks like you've got somewhere in your error template {{ path('wrong_route') }}.