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MediaWiki gives error, when press undo after a contentmodelchange
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MediaWiki fails when press the revert button after a contentmodelchange. I will upload two screenshots to show the error message

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Luke081515 raised the priority of this task from to Needs Triage.
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Restricted Application added a subscriber: Aklapper. · View Herald TranscriptJul 17 2015, 10:31 PM

M67 shows you the error message, and what do you have to do, to get this bug.

Reedy set Security to None.Jul 17 2015, 10:35 PM
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Quiddity triaged this task as High priority.Mar 10 2016, 8:23 PM
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I get [620c99a9] 2016-03-10 20:21:56: Fatal exception of type MWException after clicking undo at

Bawolff renamed this task from MediaWiki gives error, when press revert after a contentmodelchange to MediaWiki gives error, when press undo after a contentmodelchange.Sep 9 2016, 4:17 AM
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Your screenshot shows you clicking undo (There are other links labelled revert, so I was confused initially).

That said, we're fixing issue, this is a dupe of T145044