A quick glance doesn't find this in MediaWiki::API, perhaps the server is returning this. If I were you I'd review all open tickets (note people reporting that it doesn't login properly anymore), some testing should narrow down where the problem(s?) are.

In reply to Re^3: MediaWiki::API badtoken every now and then by marto
in thread MediaWiki::API badtoken every now and then by Skeeve

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