Retriggering an open door after loading a save game causes crash

If the game is saved while a door is open and the game is then reloaded, a crash will occur if the player attempts to manually close the door by pressing it again. The crash does not occur if the door is allowed to close on its own, and the proximity of the player to the door has no effect (he does not need to be beneath it, for example).

This error occurs only in Doom v1.1 and 1.2. id Software noted this bug was fixed in the v1.666 release.

A video demonstrating this error is available at YouTube. When the player attempts to close the door manually, a Venetian blind crash occurs.