AI Occasionally Accesses Units After They Have Been Freed

[fuzzyTew]

Invalid get index 'position_on_map' (on base: 'previously freed instance').

0 - res://scripts/ai/actions/hands/move_hand.gd:15
1 - res://scripts/ai/actions/egzekutor.gd:16
2 - res://scripts/ai/ai.gd:71
3 - res://scripts/ai/ai.gd:41
4 - res://scripts/ai/ai.gd:28
5 - res://scripts/controllers/action_controller.gd:476
6 - res://scripts/ai/perform.gd:32
7 - res://scripts/timers.gd:16

Didn't find a way to copy-paste from debugger, so I transcribed the above by hand. Hopefully no typos.

[czlowiekimadlo]

This is an old issue. We were never able to make sure, that AI does not encounter old object reference somewhere. If you encounter this error, and will be able to re-create it by loading saved game and always getting it, then please include the save file, so we could debug it.