Update: I believe I have found the issue! It was to do with the "Relocate enemies if too many are obstructing paths" feature added last patch. I've updated the build and crashes should no longer happen after battles. If they still do, please send a log file. Thanks!
Some players are currently experiencing crashes upon finishing a battle.
The problem does not seem to be caused by the Enemy Passives added in the last patch, nor does it seem to be caused by loot spawning as nothing was changed. One potential cause is the "Floor Clear" message, as this is the only change I've made that affects the end of battle.
While I am unable to 100% pinpoint the problem, I've fixed some potential causes and added in some Debug lines.
If you experience this crash again, please send me your log file. Apologies, and thanks for your patience!