MobFollow.gd:69 @ move_toward_target(): Parameter "map" is null.

[snipercup]

I got this error:

E 0:33:32:0047   MobFollow.gd:69 @ move_toward_target(): Parameter "map" is null.
  <C++ Source>   modules/navigation/3d/godot_navigation_server_3d.cpp:1358 @ _query_path()
  <Stack Trace>  MobFollow.gd:69 @ move_toward_target()
                 MobFollow.gd:61 @ Physics_Update()
                 StateMachine.gd:41 @ _physics_process()

It keeps producing it when I was around rocky hill. I was at 13000 errors when I realized. I thought I fixed this long ago, but it's still here. We could fix it by implementing #438 but that's easier said then done. In the meantime we should try to come up with a solution for this error.

It's a technical problem. It sets the current navigation map in this line in MobFollow.gd: var current_chunk = mob.get_chunk_from_position(target_location), but the navigationmap might disappear after it is set. This could happen when the mob is just on the edge of a chunk, which is why it will not happen consistently.

[snipercup]

I got this in the debug output:

Tried to set navigation_map_id at (-416, 320), but it was null. last_position = (-391.9551, 1, 350.6978), last_chunk = (0.1, 0.1)
   At: res://Scripts/Mob/Mob.gd:154:update_navigation_agent_map()

I see this comment:

		# Set the last chunk to one that doesn't exist so it will try to get a new map
		last_chunk = Vector2(0.1,0.1)

But apparently the map wasn't updated for the mob and the last_chunk remained 0.1

Maybe we should clamp the mob position to 1 so that it is as though the mob walks along a grid as far as the navigation is concerned.