I receive following error sometimes:
[ERROR] Script execution error: [string "scripts/manager_effect.lua"]:185: attempt to index local 'nodeEffect' (a userdata value)
Steps taken:
When manually set wounds to monster with regeneration.
Start clicking on next turn button for multiple turns.

Bug185.jpg GIF, with my attempt at reproducing this
fgu_logs_20210227.2.zip logs. This campaign used to have extensions, but I've turned off all of them.