Internal server error after upgrading with docker


I have been running a nextcloud docker container with letsencrypt and collabora for some time without issues.
Some days ago I upgraded with docker-compose and the login-prompt does work, but all users are directed to the internal server error
Happened after the upgrade where afaik only nextcloud was upgraded to 16.0.3

Nextcloud version 16.0.3
Ubuntu 18.04
Apache 2.4.25
PHP version 7.3.7

Next cloud log entry:

Anybody have a clue?
Thanks in advance!