Attempt to call method 'get_working_regions'

Support Bug Reports
1

Summary:
Tried to build a building depressed into the ground 1 block (floor on the ground level).

Steps to reproduce:

I’ve placed several buildings and forgot to separate them into different buildings. So I erased all the buildings I didn’t need atm with “Erase” tool, then started construction.
Got this error after several blocks for floor were mined out.

Actual Results:

release-825 (x64)
...tonehearth/components/building2/building_monitor.lua:168: attempt to call method 'get_working_regions' (a nil value)
stack traceback:
	radiant/modules/commons.lua:53: in function 'report_traceback'
	radiant/modules/commons.lua:64: in function 'get_working_regions'
	...tonehearth/components/building2/building_monitor.lua:168: in function '_on_building_progress_slow'
	...tonehearth/components/building2/building_monitor.lua:157: in function 'fn'
	radiant/controllers/nonpersistent_timer.lua:56: in function 'fire'
	radiant/controllers/time_tracker_controller.lua:86: in function <radiant/controllers/time_tracker_controller.lua:86>
	[C]: in function 'xpcall'
	radiant/modules/commons.lua:73: in function 'xpcall'
	radiant/controllers/time_tracker_controller.lua:86: in function 'set_now'
	radiant/controllers/time_tracker_controller.lua:126: in function 'increment_now'
	radiant/modules/timer.lua:13: 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:405: in function '_trigger_gameloop'
	radiant/modules/events.lua:453: in function '_update'
	radiant/server.lua:67: in function <radiant/server.lua:64>

Version Number and Mods in use:

A24 new builder r825

System Information:
Win7 x64