A user reported a crash with Unknown key! error when trying to load a save game in MI4 today on IRC/Discord. @henke37 suggested that the likely culprit was the code changed in this pull request.
I don't have the game, and the demo doesn't let me save games. So I am unable to test this. This is why I am proposing this as a pull request so that developers who know the engine or can at least test it can validate the change.
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