Fatal error: Uncaught Symfony\Component\Debug\Exception\FatalThrowableError: Fatal error: Call to a member function getId() on null in /home/users/gliwice/public_html/gliwice/src/AppBundle/Controller/EducationController.php:82 Stack trace: #0 [internal function]: AppBundle\Controller\EducationController->categoryAction(Object(Symfony\Component\HttpFoundation\Request), '') #1 /home/users/gliwice/public_html/gliwice/app/bootstrap.php.cache(3110): call_user_func_array(Array, Array) #2 /home/users/gliwice/public_html/gliwice/app/bootstrap.php.cache(3072): Symfony\Component\HttpKernel\HttpKernel->handleRaw(Object(Symfony\Component\HttpFoundation\Request), 1) #3 /home/users/gliwice/public_html/gliwice/app/bootstrap.php.cache(3223): Symfony\Component\HttpKernel\HttpKernel->handle(Object(Symfony\Component\HttpFoundation\Request), 1, true) #4 /home/users/gliwice/public_html/gliwice/app/bootstrap.php.cache(2442): Symfony\Component\HttpKernel\DependencyInjection\ContainerAwareHttpKernel->handle(Object(Symfony\Component\HttpFoundatio in /home/users/gliwice/public_html/gliwice/app/bootstrap.php.cache on line 3122