**Symfony version(s) affected**: 4.2.5 **Description** A dot in the name of an environment causes problems with cache loading. ```bash PHP Fatal error: Uncaught Symfony\Component\Debug\Exception\FatalThrowableError: Undefined constant 'Container7x1NQ4E\srcApp_KernelTest' in /symfony-project/var/cache/test.dev/srcApp_KernelTest.devDebugContainer.php:5 ``` **How to reproduce** Set the APP_ENV to the `test.env` for example... or run console with `--env=test.dev`.