Freeze/crash in Beach map (Zana daily mission)

I entered the map for Zana's daily mission (Beach), killed a few monsters, then walked up and right towards a strongbox (towards it; I didn't click it). The game froze (midstep, the game froze, not just my character), so I killed the process. I tried again, same result. The third time, I typed /bug and took the following screenshot: http://i.imgur.com/J91nO9h.jpg