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Android Studio or IntelliJ IDEA "Cannot undo. Unexpected document state"

Why does Android Studio give me this message sometimes when I try to undo?:

Cannot undo. Unexpected document state

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Solution

  • This is an old bug reported here.

    I've just had the same error in 2023: my uncommitted changes just disappeared in the file for no reason (after running an npm build) and I could not undo it.

    As @Steven commented, local history helped:

    Go to file -> local history -> show history and pick the latest.

    Congrats, your 10h of work are saved!