Hi @matheusfd,
thank you very much for your quick help and your time.
I have checked all donations. There is no entry with “Untitled” or “0$” there.
Of the “data migrations” only one of these “set_automatic_formatting_option” was pending. I started re-run and it is now on “Success”.
But unfortunately the problem is still the same. When I send a donation and the website should start redirecting to Paypal or when I want to start a transfer, then the WordPress error message comes: “There was a critical error on your website.” The log or wp-debug shows the above errors.
What else could be the reason?
Thank you!