Yesterday, a user reported having problem with my tool, WPCleaner, getting error messages "assertuserfailed - Assertion that the user is logged in failed" when trying to save pages.
I also got them a few minutes ago, restarted the tool, and the problem was gone.

Has there been any modification on the API or MW that can explain this error message ?
I'm pretty sure I haven't changed anything in the way I use the API, so I'm wondering what's the cause.


[1] https://en.wikipedia.org/wiki/Wikipedia:WPCleaner