0.30.6 crash when following

[Hellhound1]

Started to follow some guys who were on patrol heading on their way out of brink (in the hope of ambushing them..) but to stop my guys getting too close i clicked walk, so they'd match the patrol's speed, but instead i got a super crash.

The dump file is empty, but it did make a log thingy and something about threads crashing, so it might be of some use to you..