Stack Traceback Error when attacked

Summary:
been attacked plenty of times, this is the first engine error i had during an attack

Steps to reproduce:

  1. got attack, tree dudes attack someone in a structure
  2. engine error, while i was in the new building editor

Expected Results:

Actual Results:

release-834 (x64)
stonehearth/components/building2/building.lua:810: attempt to index a nil value
stack traceback:
radiant/modules/commons.lua:53: in function ‘report_traceback’
radiant/modules/commons.lua:64: in function <radiant/modules/commons.lua:58>
stonehearth/components/building2/building.lua:810: in function ‘method’
radiant/modules/events.lua:81: in function ‘instance’
radiant/modules/events.lua:291: in function <radiant/modules/events.lua:285>
[C]: in function ‘xpcall’
radiant/modules/commons.lua:73: in function ‘xpcall’
radiant/modules/events.lua:285: in function ‘trigger’
radiant/modules/events.lua:375: in function <radiant/modules/events.lua:374>
[C]: in function ‘xpcall’
radiant/modules/commons.lua:73: in function ‘xpcall’
radiant/modules/events.lua:374: in function ‘_fire_async_triggers’
radiant/modules/events.lua:452: in function ‘_update’
radiant/server.lua:66: in function <radiant/server.lua:63>

Notes:

Attachments:

Version Number and Mods in use:

System Information: