Error on game load: scaffolding_region.lua:714: attempt to index a nil value

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1

Summary:
Every time I open this game, an error pops up:

develop-3116 (x64)
...hearth/components/scaffolding/scaffolding_region.lua:714: attempt to index a nil value
stack traceback:
	[C]: ?
	...hearth/components/scaffolding/scaffolding_region.lua:714: in function '_start_erasing'
	...hearth/components/scaffolding/scaffolding_region.lua:227: in function <...hearth/components/scaffolding/scaffolding_region.lua:220>

Steps to reproduce:

  1. Open this particular save game (I’ll link to the saved game)
  2. Observe the error in the error pop-up

Expected Results:
No error message

Actual Results:
An error message

Notes:
possibly related post: http://discourse.stonehearth.net/t/errors-in-alpha-18/24624/3

Attachments:
Save game zip archive

Version Number and Mods in use:
Alpha 18, develop-3116 (x64), and previous build (develop-3109, was it?)
No mods.

System Information:

2

I’m getting the same error everytime I load my world.

develop-3116 (x64)
…hearth/components/scaffolding/scaffolding_region.lua:714: attempt to index a nil value
stack traceback:
[C]: ?
…hearth/components/scaffolding/scaffolding_region.lua:714: in function ‘_start_erasing’
…hearth/components/scaffolding/scaffolding_region.lua:227: in function <…hearth/components/scaffolding/scaffolding_region.lua:220>

I’m also getting the following errors with it.

develop-3116 (x64)
c++ exception: lua runtime error
stack traceback:

develop-3116 (x64)
…/components/scaffolding/scaffolding_project_flat.lua:99: attempt to index field ‘_scaffolding_region’ (a nil value)
stack traceback:
[C]: ?
…/components/scaffolding/scaffolding_project_flat.lua:99: in function <…/components/scaffolding/scaffolding_project_flat.lua:95>

Because of these errors, my hearthlings won’t really build, they only dig out the ground and stop building…