Scaffolding Error again :(

I received this error and now each time I start this save game the error window reappears.

release-703 (x64)
…hearth/components/scaffolding/scaffolding_region.lua:1092: attempt to index field ‘_scaffolding_region’ (a nil value)
stack traceback:
radiant/modules/common.lua:245: in function 'report_traceback’
radiant/modules/common.lua:256: in function <radiant/modules/common.lua:250>
…hearth/components/scaffolding/scaffolding_region.lua:1092: in function ‘_update_scaffolding_size’
…hearth/components/scaffolding/scaffolding_region.lua:499: in function 'fn’
radiant/modules/events.lua:288: in function <radiant/modules/events.lua:285>
[C]: in function 'xpcall’
radiant/modules/common.lua:265: 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/server.lua:61: in function <radiant/server.lua:58>

As far as I can tell, there is NO extraneous scaffolding remaining.

Edited to add: Here is the zipped saved game:
<div style=font-size:9px;font-family:Arial, Helvetica, sans-serif;width:127px;font-color:#44a854;> online backup storage

2 posts were merged into an existing topic: Stepped Rayya roofs a no-go