This happens when Picker Dollies is used with the scenario of Search Lights.
I report it here because it's obviously coming from code of this mod.
Error AppManagerStates.cpp:2513: The mod Picker Dollies (1.2.5) caused a non-recoverable error.
Please report this error to the mod author.
Error while running event PickerDollies::on_player_removed (ID 75)
__stdlib__/stdlib/event/event.lua:368: __stdlib__/stdlib/event/player.lua:79: attempt to index field 'players' (a nil value)
stack traceback:
[C]: in function 'error'
__stdlib__/stdlib/event/event.lua:368: in function 'dispatch_event'
__stdlib__/stdlib/event/event.lua:438: in function <__stdlib__/stdlib/event/event.lua:396>