CleverRaven/Cataclysm-DDA — pull request #1497 by kevingranade (2013-06-09 07:01:24+00:00)
Title: Don't despawn monsters when exiting the game, they're already saved elsewhere.

It seems that if you save and then load your game, it duplicates the nearby monsters. It also seems a rather simple fix is to remove a redundant despawn_monsters() call.