When you talk to the merchant in the refugee center after doing the first mission for him (clearing the back bay) the option “about that job…” doesn’t disappear after turning in the quest. If you select that option it goes through as if you did the quest a second time but upon reaching the portion about reward, the game throws up “Mission_03 is not in active quest list” or something like that and the game crashes.
I think BevapDin nailed this one. Let us know if it recurs, please.