Assertion failed! - in function 'getblueprint_at_point'

release-519 (x64)
stonehearth/services/server/build/build_service.lua:1084: assertion failed!
stack traceback:
	[C]: ?
	[C]: in function 'assert'
	stonehearth/services/server/build/build_service.lua:1084: in function '_get_blueprint_at_point'
	stonehearth/services/server/build/build_service.lua:1100: in function '_fetch_blueprint_at_point'
	stonehearth/services/server/build/build_service.lua:1117: in function '_fetch_column_at_point'
	stonehearth/services/server/build/build_service.lua:1135: in function '_add_wall_span'
	stonehearth/services/server/build/build_service.lua:982: in function 'visitor_fn'
	stonehearth/lib/build_util.lua:697: in function 'grow_walls_around'
	stonehearth/services/server/build/build_service.lua:981: in function 'grow_walls'
	stonehearth/services/server/build/build_service.lua:953: in function 'cb'
	stonehearth/services/server/build/build_service.lua:1430: in function 'do_command'
	stonehearth/services/server/build/build_service.lua:952: in function <stonehearth/services/server/build/build_service.lua:950>

2 posts were merged into an existing topic: Assertion failed! - in function ‘getblueprint_at_point’ - in function ‘fetch_blueprint_at_point’