I had 2 footmen killing the occasional undead assailant (demoted to workers while there were no enemies) a few days into my latest playthrough and when the first armed goblin arrived I promoted them again and when they had killed the goblin i got this error spamming. I searched discourse for prune_dead_listeners it didnt turn up any results, so i figured i might post this:
develop-2611 (x64)
radiant/modules/events.luac:77: assertion failed!
stack traceback:
[C]: ?
[C]: in function 'assert'
radiant/modules/events.luac:77: in function '_prune_dead_listeners'
radiant/modules/events.luac:82: in function '_update'
radiant/server.luac:19: in function <radiant/server.luac:17>
It also generated/spammed a second c++ error, pointing to the above one being the traceback. Hope there is enogh info in here 