[BUGFIX] Fix access to non existing object

Fix a fatal error introduced in a previous refactoring of
the code.

Resolves: #79864
Releases: master
Change-Id: Ib50052f2d7b3485da97fbe7a4ad88041bb676dad
Reviewed-on: https://review.typo3.org/51724


Tested-by: TYPO3com <no-reply@typo3.com>
Reviewed-by: Thomas Hohn <thomas@hohn.dk>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Christian Kuhn <lolli@schwarzbu.ch>