Error when unloading the world

[Optima-L]

After unloading the world, the console starts spamming errors
Paper 1.21.3

[22:18:45] [AxMinions-EntityTracker-2/ERROR]: [EntityTracker] Failed to track entity with id 51 in world 443b3359-1cdf-4c38-85b7-d271cbbba68e, due to tracker players being null! Tracking: {CraftWorld{name=lobby}=[], CraftWorld{name=lobby_nether}=[], CraftWorld{name=lobby_the_end}=[]}
[22:18:45] [AxMinions-EntityTracker-0/ERROR]: [EntityTracker] Failed to track entity with id 52 in world 443b3359-1cdf-4c38-85b7-d271cbbba68e, due to tracker players being null! Tracking: {CraftWorld{name=lobby}=[], CraftWorld{name=lobby_nether}=[], CraftWorld{name=lobby_the_end}=[]}
[22:18:45] [AxMinions-EntityTracker-2/ERROR]: [EntityTracker] Failed to track entity with id 52 in world 443b3359-1cdf-4c38-85b7-d271cbbba68e, due to tracker players being null! Tracking: {CraftWorld{name=lobby}=[], CraftWorld{name=lobby_nether}=[], CraftWorld{name=lobby_the_end}=[]}
[22:18:45] [AxMinions-EntityTracker-1/ERROR]: [EntityTracker] Failed to track entity with id 51 in world 443b3359-1cdf-4c38-85b7-d271cbbba68e, due to tracker players being null! Tracking: {CraftWorld{name=lobby}=[], CraftWorld{name=lobby_nether}=[], CraftWorld{name=lobby_the_end}=[]}
[22:18:45] [AxMinions-EntityTracker-2/ERROR]: [EntityTracker] Failed to track entity with id 52 in world 443b3359-1cdf-4c38-85b7-d271cbbba68e, due to tracker players being null! Tracking: {CraftWorld{name=lobby}=[], CraftWorld{name=lobby_nether}=[], CraftWorld{name=lobby_the_end}=[]}

[Optima-L]

to fix I think you need to Entity#remove the minion when the world is unloaded