I have seen that same problem many times but don't have a good solution for it. I think it might happen if the sim's travel plan gets changed when it includes going through a door.
The only solution I've found so far is to go into Buy mode, turn "move_objects on" so I can delete the stuck door, and replace it. Obviously this is not an optimum fix.
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Who are all these people and what do they know? 
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