Hah, um, whoops. Surprisingly I guess there is no map bounds check on melee attacks. I'll get that fixed.
Technically the edge of the map, if you've reached it, will appear completely black, so you'll know you've reached it. Don't head in that direction for now (there is no other case where you cannot see what's adjacent to you).
The crash.log should appear in the same directory as the run.log--in fact, it's just a renamed run.log. So this attached run.log is from a different game. If you had crash uploads enabled I can pull it off the server, but from your description this should be very easy to replicate, anyway, so no need.