Bundle version 1.3.1 | Symfony version 3.3 | PHP version 7.1.9
Expected behavior
After installing the different bundles (JMSTranslationBundle, JMSDIExtraBundle, checking if i had sensio/framework-extra-bundle), and after i made the right configuration in config.yml and routing_dev.yml, the right behavior should be that the /_trans lead me to a translation interface (working), and change nothing else.
Actual behavior
Getting on a route different from /_trans return Call to a member function has() on null with error 500. Therefore, the whole site is dead, except the translation UI.
Steps to reproduce
Install JMSTranslationBundle, then when asked, install JMSDIExtraBundle to get the web ui After that, test the /_trans. This should work. But when you get to your others routes, they return 500 error

