Users »overview« page sends system error after merging two accounts.

After I merged my two accounts and logged in with the correct one I get a system error on the user overview and user edit pages. Everything else actually works fine. The error does not seem to be very insightful. But I am posting it here:

Sorry, a system error occurred

If you were just adding or changing something, Launchpad probably hasn’t recorded those changes.
What you can do

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      If you entered a lot of text that you don’t want to lose, go Back, copy the text, and paste it into a text file.
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      While you’re there, copy the URL of the page too.
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      Report the bug, after checking that it isn’t reported already. (If this error is preventing you from reporting bugs, e-mail us instead, with “Bug” in the Subject line.) In your bug report, include the URL of the page you were on, and what you tried to do.

Thanks for helping improve Launchpad, and sorry for the inconvenience.