TYPO3 Exception #1509296606 - Can anyone help me?

Hey Guys, I have a problem with one of my Typo3 site since the last core update to Typo3 8.7.32.

I get the following error messages on my subpages.

#1509296606: Failed to fetch error page “https://www.my-domain.de/404”;, reason: Server error: GET [https://www.my-domain.de/404](https://www.my-domain.de/404`) resulted in a 500 Internal Server Error response: <?xml version="1.0" encoding="utf-8"?> <!DOCTYPE html PUBLIC “-//W3C//DTD XHTML 1.1//EN” "All Standards and Drafts - W3C (truncated…)

I really don’t know how to fix this error.

I saw in your forum under the link Bug #84098: 403 forbidden error on trying to access 404 page - TYPO3 Core - TYPO3 Forge that others have also had a similar problem. But I couldn’t see how they solved it.

Can anyone help me what to do?

Thank you very much.