Null reference while creature mating

[mklingen]

https://sentry.io/organizations/cfg/issues/942590102/?project=192119&referrer=github_plugin

NullReferenceException: Object reference not set to an instance of an object.
  File "C:\Users\matth\Desktop\dwarfcorp\DwarfCorp\DwarfCorpXNA\Components\AI\CreatureAI.cs", line 184, in get_Position
    Microsoft.Xna.Framework.Vector3 get_Position()
  File "C:\Users\matth\Desktop\dwarfcorp\DwarfCorp\DwarfCorpXNA\Components\AI\MateTask.cs", line 62, in ComputeCost
    Single ComputeCost(DwarfCorp.Creature, Boolean)
  File "C:\Users\matth\Desktop\dwarfcorp\DwarfCorp\DwarfCorpXNA\Components\AI\CreatureAI.cs", line 296, in GetEasiestTask
    DwarfCorp.Task GetEasiestTask(System.Collections.Generic.List`1[DwarfCorp.Task])
  File "C:\Users\matth\Desktop\dwarfcorp\DwarfCorp\DwarfCorpXNA\Components\AI\CreatureAI.cs", line 724, in Update
    Void Update(DwarfCorp.DwarfTime, DwarfCorp.ChunkManager, DwarfCorp.Camera)
  File "C:\Users\matth\Desktop\dwarfcorp\DwarfCorp\DwarfCorpXNA\Components\Systems\ComponentManager.cs", line 247, in Update
    Void Update(DwarfCorp.DwarfTime, DwarfCorp.ChunkManager, DwarfCorp.Camera)
...
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Object reference not set to an instance of an object.