Attempt to index local 'entity' (a nil value) + two more on save load

I’ve gotten this on loading my save a few times. It also seems like when I send hearthlings to unexplored areas, the ‘fog of war’ doesn’t go away (seems to be related based on some of the lines of code):

release-523 (x64)
radiant/modules/entities.lua:287: attempt to index local ‘entity’ (a nil value)
stack traceback:
radiant/modules/common.lua:214: in function 'report_traceback’
radiant/modules/common.lua:225: in function <radiant/modules/common.lua:219>
radiant/modules/entities.lua:287: in function ‘get_world_grid_location’
…nehearth/services/server/terrain/terrain_service.lua:327: in function ‘_get_entity_visible_region’
…nehearth/services/server/terrain/terrain_service.lua:280: in function ‘_get_visible_region’
…nehearth/services/server/terrain/terrain_service.lua:210: in function ‘_update_regions’
…nehearth/services/server/terrain/terrain_service.lua:111: in function ‘_on_tick’
…nehearth/services/server/terrain/terrain_service.lua:91: 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>
[C]: in function 'xpcall’
radiant/modules/common.lua:234: in function 'xpcall’
radiant/controllers/time_tracker_controller.lua:82: in function ‘set_now’
…hearth/services/server/calendar/calendar_service.lua:374: in function ‘_on_event_loop’
…hearth/services/server/calendar/calendar_service.lua:37: in function 'instance’
radiant/modules/events.lua:209: in function <radiant/modules/events.lua:203>
[C]: in function 'xpcall’
radiant/modules/common.lua:234: in function 'xpcall’
radiant/modules/events.lua:203: in function 'trigger’
radiant/modules/events.lua:272: in function '_trigger_gameloop’
radiant/modules/events.lua:323: in function '_update’
radiant/server.lua:62: in function <radiant/server.lua:58>

The most recent load also threw the following 2 errors as well:
One:
release-523 (x64)
…th/services/server/population/population_faction.lua:286: attempt to index local ‘citizen’ (a nil value)
stack traceback:
radiant/modules/common.lua:214: in function 'report_traceback’
radiant/modules/common.lua:225: in function <radiant/modules/common.lua:219>
…th/services/server/population/population_faction.lua:286: in function ‘_monitor_citizen’
…th/services/server/population/population_faction.lua:84: in function 'obj’
radiant/modules/events.lua:76: in function 'instance’
radiant/modules/events.lua:209: in function <radiant/modules/events.lua:203>
[C]: in function 'xpcall’
radiant/modules/common.lua:234: in function 'xpcall’
radiant/modules/events.lua:203: in function <radiant/modules/events.lua:174>

Two:
release-523 (x64)
stonehearth/services/server/tasks/task_group.lua:47: attempt to index local ‘worker’ (a nil value)
stack traceback:
radiant/modules/common.lua:214: in function 'report_traceback’
radiant/modules/common.lua:225: in function <radiant/modules/common.lua:219>
stonehearth/services/server/tasks/task_group.lua:47: in function 'add_worker’
stonehearth/services/server/town/town.lua:291: in function 'join_task_group’
stonehearth/services/server/town/town.lua:225: in function '_init_alert_mode_task_groups’
stonehearth/services/server/town/town.lua:139: in function '_on_game_loaded’
stonehearth/services/server/town/town.lua:95: in function 'obj’
radiant/modules/events.lua:76: in function 'instance’
radiant/modules/events.lua:209: in function <radiant/modules/events.lua:203>
[C]: in function 'xpcall’
radiant/modules/common.lua:234: in function 'xpcall’
radiant/modules/events.lua:203: in function <radiant/modules/events.lua:174>

It also appears that the goblins are no longer enemies. I cannot attack them, but occasionally get the alert that an ‘enemy’ is in town. I also had one of my footman go warm himself by their campfire.