Engine error after log in

The below error popped up after I logged in for the first time on a new day of game play. I had logged out the previous day after playing for several hours and doing lots of things. I do not know what all I did in the previous session of play to have caused this.

release-687 (x64)
std::logic_error: 'invalid reference in native get_id’
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 'get_id’
radiant/modules/entities.lua:307: in function ‘get_world_grid_location’
…nehearth/services/server/terrain/terrain_service.lua:310: in function ‘_get_entity_visible_region’
…nehearth/services/server/terrain/terrain_service.lua:263: in function ‘_get_visible_region’
…nehearth/services/server/terrain/terrain_service.lua:193: in function ‘_update_regions’
…nehearth/services/server/terrain/terrain_service.lua:181: in function ‘_on_tick’
…nehearth/services/server/terrain/terrain_service.lua:128: in function '_fn’
radiant/controllers/timer_controller.lua:95: in function 'fire’
radiant/controllers/time_tracker_controller.lua:82: in function <radiant/controllers/time_tracker_controller.lua:82>

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>

6 posts were merged into an existing topic: Error code when continuing game