Engine Error custom building

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Summary:

develop-2860 (x64)
stonehearth/services/server/build/build_service.lua:1100: assertion failed!
stack traceback:
	[C]: ?
	[C]: in function 'assert'
	stonehearth/services/server/build/build_service.lua:1100: in function '_get_blueprint_at_point'
	stonehearth/services/server/build/build_service.lua:1116: in function '_fetch_blueprint_at_point'
	stonehearth/services/server/build/build_service.lua:1133: in function '_fetch_column_at_point'
	stonehearth/services/server/build/build_service.lua:1151: in function '_add_wall_span'
	stonehearth/services/server/build/build_service.lua:998: in function 'visitor_fn'
	stonehearth/lib/build_util.lua:697: in function 'grow_walls_around'
	stonehearth/services/server/build/build_service.lua:997: in function 'grow_walls'
	stonehearth/services/server/build/build_service.lua:969: in function 'cb'
	stonehearth/services/server/build/build_service.lua:1446: in function 'do_command'
	stonehearth/services/server/build/build_service.lua:968: in function <stonehearth/services/server/build/build_service.lua:966>

Steps to reproduce:
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Expected Results:

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Notes:

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Version Number and Mods in use:

System Information: