Bonk when trying to mark multiple comments

Today I used the akismet plugin for the first time.
I had for comments in the spam queue, which where not spam. I selected them and clicked on not spam but the popup showed a "Bonk" error.
Then I selected a single message, clicked on "not spam", and all messages disappeared from the spam queue. What do you think happened?
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I think an error happened.
Perhaps you could report the actual error.
What version of Vanilla are you running?
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I am running 2.0.18.4. I'll post the actual error if it happens again.