Object reference not set to an instance of an object
  at Verse.RegionAndRoomUpdater.NotifyAffectedRoomsAndRoomGroupsAndUpdateTemperature () [0x0014c] in C:\Dev\RimWorld\Assets\Scripts\Verse\Map\RegionsAndRooms\RegionAndRoomUpdater.cs:431
  at Verse.RegionAndRoomUpdater.CreateOrUpdateRooms () [0x000a4] in C:\Dev\RimWorld\Assets\Scripts\Verse\Map\RegionsAndRooms\RegionAndRoomUpdater.cs:176
  at Verse.RegionAndRoomUpdater.TryRebuildDirtyRegionsAndRooms () [0x00075] in C:\Dev\RimWorld\Assets\Scripts\Verse\Map\RegionsAndRooms\RegionAndRoomUpdater.cs:83
  at Verse.RegionGrid.GetValidRegionAt (IntVec3 c) [0x0006c] in C:\Dev\RimWorld\Assets\Scripts\Verse\Map\RegionsAndRooms\RegionGrid.cs:122
  at Verse.RegionAndRoomQuery.RegionAt (IntVec3 c, Verse.Map map, RegionType allowedRegionTypes) [0x0000e] in C:\Dev\RimWorld\Assets\Scripts\Verse\Map\RegionsAndRooms\RegionAndRoomQuery.cs:20
  at Verse.GridsUtility.GetRegion (IntVec3 loc, Verse.Map map, RegionType allowedRegionTypes) [0x00000] in C:\Dev\RimWorld\Assets\Scripts\Verse\Map\Grids\GridsUtility.cs:18
  at Verse.Area.MarkDirty (IntVec3 c) [0x0000b] in C:\Dev\RimWorld\Assets\Scripts\Verse\Map\Areas\Area.cs:114
  at Verse.Area.Set (IntVec3 c, Boolean val) [0x00032] in C:\Dev\RimWorld\Assets\Scripts\Verse\Map\Areas\Area.cs:107
  at RimWorld.Area_Home.Set (IntVec3 c, Boolean val) [0x0000e] in C:\Dev\RimWorld\Assets\Scripts\RimWorld\Map\Areas\Areas_Various.cs:128
  at Verse.Area.set_Item (IntVec3 c, Boolean value) [0x00000] in C:\Dev\RimWorld\Assets\Scripts\Verse\Map\Areas\Area.cs:56
  at RimWorld.AutoHomeAreaMaker.Notify_BuildingSpawned (Verse.Thing b) [0x000c0] in C:\Dev\RimWorld\Assets\Scripts\RimWorld\Utility\AutoHomeAreaMaker.cs:36
  at Verse.Building.SpawnSetup (Verse.Map map, Boolean respawningAfterLoad) [0x00140] in C:\Dev\RimWorld\Assets\Scripts\Verse\Thing\Building.cs:74
  at Verse.GenSpawn.Spawn (Verse.Thing newThing, IntVec3 loc, Verse.Map map, Rot4 rot, Boolean respawningAfterLoad) [0x000d7] in C:\Dev\RimWorld\Assets\Scripts\Verse\Utility\Gen\Placement\GenSpawn.cs:65
  at RimWorld.Designator_Build.DesignateSingleCell (IntVec3 c) [0x0009e] in C:\Dev\RimWorld\Assets\Scripts\RimWorld\UI\Designators\Place\Designator_Build.cs:273
  at Verse.Designator.DesignateMultiCell (IEnumerable`1 cells) [0x0004d] in C:\Dev\RimWorld\Assets\Scripts\Verse\UI\Designator\Designator.cs:113
  at Verse.DesignatorManager.ProcessInputEvents () [0x0014c] in C:\Dev\RimWorld\Assets\Scripts\Verse\UI\Designator\DesignatorManager.cs:105
  at RimWorld.MapInterface.HandleMapClicks () [0x00021] in C:\Dev\RimWorld\Assets\Scripts\RimWorld\UI\MapInterface.cs:142
  at RimWorld.UIRoot_Play.UIRootOnGUI () [0x00143] in C:\Dev\RimWorld\Assets\Scripts\RimWorld\UI\UIRoot_Play.cs:96
  at Verse.Root.OnGUI () [0x00046] in C:\Dev\RimWorld\Assets\Scripts\Verse\Global\Root\Root.cs:151