Engine error 593

Summary:
Never seen this one before, haven’t a clue what is causing it.

release-593 (x64)
…onehearth/components/building/building_component.lua:853: attempt to index local ‘fab’ (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>
…onehearth/components/building/building_component.lua:853: in function ‘can_scaffolding_clear’
…hearth/components/scaffolding/scaffolding_region.lua:316: in function 'instance’
radiant/modules/events.lua:227: in function <radiant/modules/events.lua:221>
[C]: in function 'xpcall’
radiant/modules/common.lua:257: in function 'xpcall’
radiant/modules/events.lua:221: in function ‘trigger’
…earth/components/fabricator/fabricator_component.lua:277: in function 'fn’
radiant/modules/events.lua:224: in function <radiant/modules/events.lua:221>
[C]: in function ‘xpcall’

radiant/controllers/time_tracker_controller.lua:82: in function 'set_now’
radiant/controllers/time_tracker_controller.lua:103: in function 'increment_now’
radiant/modules/timer.lua:13: in function 'instance’
radiant/modules/events.lua:227: in function <radiant/modules/events.lua:221>
[C]: in function 'xpcall’
radiant/modules/common.lua:257: in function 'xpcall’
radiant/modules/events.lua:221: in function 'trigger’
radiant/modules/events.lua:290: in function '_trigger_gameloop’
radiant/modules/events.lua:338: in function '_update’
radiant/server.lua:62: in function <radiant/server.lua:58>

Steps to reproduce:

  1. unsure

Notes:
I did finish a building that had started to be built in the previous build. This maybe have something to do with it.

Attachments:

Version Number and Mods in use:
593 no mods

System Information:

Just got the same one XD. it doesnt want me to build at all now. I did use ib in console on the building i was trying to attach a path to but thats all.