Error updating AI KeyNotFoundException

[Krilliac]

System.Collections.Generic.KeyNotFoundException: The given key '79' was not present in the dictionary.
at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
at Mangos.World.Objects.WS_Creatures.CreatureObject.AddToWorld() in D:\USB DRIVE\Work\MangosSharp\MangosSharp\Source\Services\Mangos.World\Objects\WS_Creatures.cs:line 1787
at Mangos.World.Objects.WS_Creatures.CreatureObject.Respawn() in D:\USB DRIVE SHIT\Work\MangosSharp\MangosSharp\Source\Services\Mangos.World\Objects\WS_Creatures.cs:line 1749
at Mangos.World.AI.WS_Creatures_AI.DefaultAI.DoThink() in D:\USB DRIVE\Work\MangosSharp\MangosSharp\Source\Services\Mangos.World\AI\WS_Creatures_AI.DefaultAI.cs:line 352
at Mangos.World.Server.WS_TimerBasedEvents.TAIManager.Update(Object state) in D:\USB DRIVE\Work\MangosSharp\MangosSharp\Source\Services\Mangos.World\TimerBasedEvents\WS_TimerBasedEvents.TAIManager.cs:line 86

[Krilliac]

occurred during runtime