It seems like $container->get($config[...orage_entity_manager']) can also be of type null; however, parameter $entityManager of DH\DoctrineAuditBundle\A...guration::__construct() does only seem to accept Doctrine\ORM\EntityManagerInterface, maybe add an additional type check?
(
Ignorable by Annotation
)
If this is a false-positive, you can also ignore this issue in your code via the ignore-type annotation