This has occurred on two separate playthroughs.
During the battle that happens when thieves attack the camp (Thief Attack), if enemies step onto caltrops, it can cause the game to freeze. It doesn't crash, it just stops progressing. I can still right-click on characters to open their info pages. I can't open any menus.
It does not happen every time.
In the screenshot, the assassin has stepped onto caltrops and the game has stopped.
Thanks for the report, Sage! This is fixed (https://sinisterdesign.net/forum/index.php?topic=3371.msg54011#msg54011) for the next update.
Ah, my apologies! I searched for caltrops instead of traps while looking for known/fixed bugs.
No worries! Thanks for reporting the issue. :)