This is a result of lack of sorting in User::getGroups(). Encountered this myself in my dev wiki, not sure how to repro.
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Change 350908 had a related patch set uploaded (by Krinkle; owner: MaxSem):
[mediawiki/core@master] Sort user groups
Change 350908 merged by jenkins-bot:
[mediawiki/core@master] user: Ensure returned user groups are sorted
I'm getting this deterministically in Vagrant now; not sure if it's caused by the patch, not fixed by it or entirely unrelated. I'm guessing the last because as far as I can tell there isn't even any API request happening.
Change 482576 had a related patch set uploaded (by Gergő Tisza; owner: Gergő Tisza):
[mediawiki/core@master] Special:UserRights: Fix handling of empty conflict check value
I'm getting this on beta right now
While trying to promote to an admin
https://commons.wikimedia.beta.wmflabs.org/wiki/Special:UserRights/Fisch-WMDE
Change 482576 merged by jenkins-bot:
[mediawiki/core@master] Special:UserRights: Fix handling of empty conflict check value