I have verified this 3 times now. Attack the brigands adjacent to my party's position. Use tactical combat (not auto resolve). I used my firebolt on each enemy to win the combat.

Crash after combat.

EDIT: Use the auto save file not the named _working_dont_use one.

Once the auto save is loaded you'll have to move 2-3 spaces N/NW to encounter the brigands. I tried to save a game when I was directly adjacent, but when that file/save is loaded (_working_dont_use), the problem goes away.