Crashing gameplay

baseItem should not be NULL.System.Exception: baseItem should not be NULL.
  at HighTreason.Libraries.Common.Guard.IsNotNull(Object obj, String param)
  at HighTreason.WindowsStore.GameControl.Helpers.ItemChainHelper.GetLastAttached[T](ImageItem2D baseItem)
  at HighTreason.WindowsStore.GameControl.Helpers.RemoveHelper.OnRememberItemToRemove(WorldItem2D item)
  at HighTreason.WindowsStore.GameControl.GameController.RememberItemToRemove(WorldItem2D item)
  at HighTreason.WindowsStore.GameControl.Helpers.BuilderScripts.RemoveOrKill(WorldItem2D item, Action`1 removeItem)
  at HighTreason.WindowsStore.GameControl.Helpers.BuilderScripts.BuildGround(WorldItem2D attachOnItem, Ground2D groundToPlace, WorldEvents worldEvents, Dictionary`2 layerImageMap, PayDelegate pay)
  at HighTreason.WindowsStore.GameControl.Commands.BuildCmd.TryAttachItem(PointF2D worldCoordinates)
  at HighTreason.WindowsStore.GameControl.Commands.BuildCmd.OnMouseUpLeft(MousePosition e)
  at HighTreason.WindowsStore.GameControl.Commands.CommandBase.MouseUpLeft(MousePosition e)
  at HighTreason.WindowsStore.GameControl.GameController.ProcessMouseUpLeft(Int32 x, Int32 y)
  at HighTreason.WindowsStore.Input.MouseListener.HandleMouseInput(MouseState mouseState)
  at HighTreason.WindowsStore.Input.MouseListener.Update(TimeSpan elapsedTime)
  at HighTreason.WindowsStore.GameControl.GameController.Update(TimeSpan simulationTime, TimeSpan gameTime)
  at HighTreason.WindowsStore.Game.Game.Update(GameTime gameTime)

This bug is already fixes in the release, coming in December.
Thank's a lot for your help!