machwert

Does a workaround exist? Downgrading news to 8.3.0 (suggested by @rasgor) does not help in my case. I use TYPO3 10, news 8.3.0 and eventnews 4.0.0.

Thanks georgringer. Unfortunately it didn't help. I updated news to 8.5.2 from master. I still get the isEvent-Errors (every couple of hours) and this new error: `Core: Exception handler (WEB):...

Thanks a lot @vertexvaar! The error is gone with your proposed changes in EXT:news' Services.yaml.