Engine Error Error Pop-UP

release-737 (x64)
stonehearth/services/server/build/ladder_builder.lua:280: assertion failed!
stack traceback:
radiant/modules/common.lua:245: in function 'report_traceback’
radiant/modules/common.lua:256: in function <radiant/modules/common.lua:250>
[C]: in function 'assert’
stonehearth/services/server/build/ladder_builder.lua:280: in function '_get_climb_to’
stonehearth/services/server/build/ladder_builder.lua:296: in function '_update_build_mode’
stonehearth/services/server/build/ladder_builder.lua:180: in function 'add_point’
stonehearth/services/server/build/ladder_manager.lua:49: in function 'request_ladder_to’
stonehearth/services/server/build/build_service.lua:1503: in function 'request_ladder_to’
stonehearth/components/scaffolding/scaffolding.lua:526: in function 'request_ladder’
stonehearth/components/scaffolding/scaffolding.lua:571: in function 'request_ladder_to’
stonehearth/components/scaffolding/scaffolding.lua:619: in function '_update_ladders’
stonehearth/components/scaffolding/scaffolding.lua:310: in function ‘recalculate_scaffolding_blueprint’
…hearth/services/server/build/scaffolding_manager.lua:288: in function ‘_process_changes’
…hearth/services/server/build/scaffolding_manager.lua:278: in function 'obj’
radiant/modules/events.lua:83: in function 'instance’
radiant/modules/events.lua:291: 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:398: in function '_trigger_gameloop’
radiant/modules/events.lua:446: in function '_update’
radiant/server.lua:61: in function <radiant/server.lua:58>

@LeeJow do you know what was happening in the game when this error appeared?
Was your building adjacent to a mountain or something?