Water physics engine error

attempted to dig a moat around my town and got this error. hope this helps:

release-687 (x64)[M]
stonehearth/components/water/water_component.lua:794: assertion failed!
stack traceback:
radiant/modules/common.lua:237: in function 'report_traceback’
radiant/modules/common.lua:248: in function <radiant/modules/common.lua:242>
[C]: in function 'assert’
stonehearth/components/water/water_component.lua:794: in function '_remove_height’
stonehearth/components/water/water_component.lua:261: in function '_remove_water’
stonehearth/components/water/water_component.lua:473: in function ‘fill_channel_from_water_region’
…hearth/services/server/hydrology/channel_manager.lua:561: in function ‘callback_fn’
…hearth/services/server/hydrology/channel_manager.lua:194: in function ‘each_channel_ascending’
…hearth/services/server/hydrology/channel_manager.lua:559: in function ‘fill_channels_to_capacity’
…arth/services/server/hydrology/hydrology_service.lua:768: in function ‘_on_tick’
…arth/services/server/hydrology/hydrology_service.lua:52: in function ‘fn’

radiant/controllers/time_tracker_controller.lua:82: in function ‘set_now’
…hearth/services/server/calendar/calendar_service.lua:379: in function ‘_on_event_loop’
…hearth/services/server/calendar/calendar_service.lua:37: in function 'instance’
radiant/modules/events.lua:291: in function <radiant/modules/events.lua:285>
[C]: in function 'xpcall’
radiant/modules/common.lua:257: 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>

A post was merged into an existing topic: [DEV-3030] Engine errors when making a river