gridelement: freezing backend when opening new content element wizard

Question

we have the problem that the complete Backend of TYPO3 is freezing when adding a new content element to a gridelement.

What we do: adding new content element in a gridelement - opening the new content element wizard which remains empty. After a few seconds the whole backend freezes. Only possibility is releading the backend.

TYPO3 9.5.18 and 9.5.20 Gridelements 9.1.1

Any help? Thanks!

Answer 1

Update to newest version which runs on TYPO3 9 fixes the problem.