Accepting "custom" flag returns 500 if post was edited in the meantime

[Sujan (Jan P.)]

Feels pretty similar to

"Akismet" plugin always returns "Sorry, an error has occured." although everything works as expected

Oh there is an Akismet report about a spam post: [1] Nope, not spam. I click “Not Spam”. But I get “Sorry, an error has occured.”: [2] But the report is gone: [3] And the log shows that the post was correctly “confirmed not spam”: [4] Anyone else having this problem?