(Dev 524) error lua:750 failed roof computing

tried placing a roof over manually placed walls with slabs on some part of the building.

release-524 (x64)stonehearth/lib/build_util.lua:750: assertion failed!stack traceback:
[C]: ?
[C]: in function ‘assert’
stonehearth/lib/build_util.lua:750: in function ‘create_edge_loop_for_wall’
stonehearth/lib/build_util.lua:758: in function ‘create_edge_loop_for_wall’
stonehearth/lib/build_util.lua:758: in function ‘create_edge_loop_for_wall’
stonehearth/lib/build_util.lua:758: in function ‘create_edge_loop_for_wall’
stonehearth/lib/build_util.lua:758: in function ‘create_edge_loop_for_wall’
stonehearth/lib/build_util.lua:837: in function ‘calculate_roof_shape_around_walls’
…th/services/client/build_editor/grow_roof_editor.lua:119: in function ‘_compute_roof_region’
…th/services/client/build_editor/grow_roof_editor.lua:72: in function ‘fn’
…ces/client/selection/entity_or_location_selector.lua:202: in function ‘_get_selected_entity’
…ces/client/selection/entity_or_location_selector.lua:238: in function ‘_on_mouse_event’
…nehearth/services/client/selection/selector_base.lua:115: in function ‘_mouse_cb’
stonehearth/services/client/input/input_capture.lua:49: in function ‘_dispatch’
stonehearth/services/client/input/input_service.lua:55: in function ‘_dispatch_input’
stonehearth/services/client/input/input_service.lua:12: in function <stonehearth/services/client/input/input_service.lua:11>

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