(Filename: C:/buildslave/unity/build/artifacts/generated/common/runtime/DebugBindings.gen.cpp Line: 51)

System.NullReferenceException: Object reference not set to an instance of an object
  at RimWorld.Planet.WorldPawns.WorldPawnsTick () [0x00000] in <filename unknown>:0
  at RimWorld.Planet.World.WorldTick () [0x00000] in <filename unknown>:0
  at Verse.TickManager.DoSingleTick () [0x00000] in <filename unknown>:0