Engine Error on building destruction

Summary:
Engine Error when ‘remove’ option used for existing structure (Cottage for Two)

Steps to reproduce:

release-687 (x64)
...ices/client/renderer/construction_render_tracker.lua:267: attempt to index a nil value
stack traceback:
	radiant/modules/common.lua:237: in function 'report_traceback'
	radiant/modules/common.lua:248: in function <radiant/modules/common.lua:242>
	...ices/client/renderer/construction_render_tracker.lua:267: in function 'fn'
	radiant/modules/events.lua:288: in function <radiant/modules/events.lua:285>
	[C]: in function 'xpcall'
	radiant/modules/common.lua:257: in function 'xpcall'
	radiant/modules/events.lua:285: in function 'trigger'
	radiant/modules/events.lua:370: in function '_fire_async_triggers'
	radiant/modules/events.lua:445: in function '_update'
	radiant/client.lua:43: in function <radiant/client.lua:38>

System Information:
Windows 10

Another similar error when destroying the Tier 2 ‘Blacksmith House’. the Blacksmith House had become ‘stuck’ i.e the builders would not complete the house even though materials were available.

release-687 (x64)
...ices/client/renderer/construction_render_tracker.lua:267: attempt to index a nil value
stack traceback:
	radiant/modules/common.lua:237: in function 'report_traceback'
	radiant/modules/common.lua:248: in function <radiant/modules/common.lua:242>
	...ices/client/renderer/construction_render_tracker.lua:267: in function 'fn'
	radiant/modules/events.lua:288: in function <radiant/modules/events.lua:285>
	[C]: in function 'xpcall'
	radiant/modules/common.lua:257: in function 'xpcall'
	radiant/modules/events.lua:285: in function 'trigger'
	radiant/modules/events.lua:370: in function '_fire_async_triggers'
	radiant/modules/events.lua:445: in function '_update'
	radiant/client.lua:43: in function <radiant/client.lua:38>

I get the same thing when I remove a building. I also get an engine error that is posted below.

release-687 (x64)
…ices/client/renderer/construction_render_tracker.lua:267: attempt to index a nil value
stack traceback:
radiant/modules/common.lua:237: in function 'report_traceback’
radiant/modules/common.lua:248: in function <radiant/modules/common.lua:242>
…ices/client/renderer/construction_render_tracker.lua:267: in function ‘_update_camera’
…ices/client/renderer/construction_render_tracker.lua:208: in function 'fn’
radiant/modules/events.lua:288: in function <radiant/modules/events.lua:285>
[C]: in function 'xpcall’
radiant/modules/common.lua:257: in function 'xpcall’
radiant/modules/events.lua:285: in function 'trigger’
radiant/modules/events.lua:370: in function '_fire_async_triggers’
radiant/modules/events.lua:445: in function '_update’
radiant/client.lua:43: in function <radiant/client.lua:38>

A post was merged into an existing topic: Engine error about scaffolding A19