Fatal error: Cannot use isset() on the result of an expression (you can use "null !== expression" instead) in /var/www/clients/client1/web1/web/src/AppBundle/Command/MechaUpdate.php on line 105

Fatal error: Uncaught Symfony\Component\DependencyInjection\Exception\ServiceCircularReferenceException: Circular reference detected for service "appbundle.mechaupdate", path: "appbundle.mechaupdate -> easyadmin.listener.exception -> twig -> appbundle.xpupdate". in /var/www/clients/client1/web1/web/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Container.php:269 Stack trace: #0 /var/www/clients/client1/web1/web/var/cache/prod/appProdProjectContainer.php(746): Symfony\Component\DependencyInjection\Container->get('appbundle.mecha...') #1 /var/www/clients/client1/web1/web/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Container.php(305): appProdProjectContainer->getAppbundle_XpupdateService() #2 /var/www/clients/client1/web1/web/var/cache/prod/appProdProjectContainer.php(3754): Symfony\Component\DependencyInjection\Container->get('appbundle.xpupd...') #3 /var/www/clients/client1/web1/web/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Container.php(305): appProdProjectCont in /var/www/clients/client1/web1/web/vendor/symfony/symfony/src/Symfony/Component/DependencyInjection/Container.php on line 269