traders in general i think.
EDIT: aha i've found what's causing it. apparently i was selling an equipped piece of armour. so kinda my fault. as the game crashed twice when trying to sell equipped armour, when i went in and didn't sell it it worked okay.
so uh yeah don't sell equipped stuff, imho it shouldn't be an option to sell equipped stuff if the game crashes as a direct result.
in an otherwise really good game the bugs are killing it slowly but surely. this is unfortunate.
2 previous crashes were totally random.
:(
pls help game people. (yes i have pc version, yes i have latest updates as of 11.30...23/10/2011)
