18:44:36.0356 [FATAL]  Initializer: System.NullReferenceException: Object reference not set to an instance of an object.
   at VRage.Game.Components.MyHierarchyComponentBase.RemoveChild(IMyEntity child, Boolean preserveWorldPos)
   at VRage.Game.Entity.MyEntity.RefreshModels(String model, String modelCollision)
   at Sandbox.Game.Entities.MyCubeBlock.UpdateVisual()
   at Sandbox.Game.Entities.Cube.MySlimBlock.UpdateVisual(Boolean updatePhysics)
   at Sandbox.Game.Entities.Cube.MySlimBlock.DecreaseMountLevel(Single grinderAmount, MyInventoryBase outputInventory, Boolean useDefaultDeconstructEfficiency, Int64 identityId, Boolean testingMode)
   at Sandbox.Game.Weapons.MyShipGrinder.Activate(HashSet`1 targets)
   at Sandbox.Game.Weapons.MyShipToolBase.ActivateCommon()
   at Sandbox.Game.Weapons.MyShipToolBase.UpdateAfterSimulation10()
   at Sandbox.Game.Weapons.MyShipGrinder.UpdateAfterSimulation10()
   at Patched_Sandbox.Game.Entities.MyParallelEntityUpdateOrchestratorUpdateAfterSimulation10_0(Object )
   at Sandbox.Game.Entities.MyParallelEntityUpdateOrchestrator.DispatchAfterSimulation()
   at Sandbox.Game.Entities.MyEntities.UpdateAfterSimulation()
   at Sandbox.Game.World.MySector.UpdateAfterSimulation()
   at Patched_Sandbox.Game.World.MySessionUpdateComponents_0(Object )
   at Patched_Sandbox.Game.World.MySessionUpdate_0(Object , MyTimeSpan )
   at Sandbox.MySandboxGame.Update()
   at Patched_Sandbox.Engine.Platform.GameUpdateInternal_0(Object )
   at Patched_Sandbox.Engine.Platform.GameRunSingleFrame_0(Object )
   at Patched_Sandbox.Engine.Platform.FixedLoop+<>c__DisplayClass11_0<Run>b__0_0(Object )
   at Sandbox.Engine.Platform.GenericLoop.Run(VoidAction tickCallback)
   at Sandbox.Engine.Platform.Game.RunLoop()
   at Sandbox.MySandboxGame.Run(Boolean customRenderLoop, Action disposeSplashScreen)
   at Torch.VRageGame.DoStart() in C:\build\workspace\Torch_Torch_master\Torch\VRageGame.cs:line 288
   at Torch.VRageGame.Run() in C:\build\workspace\Torch_Torch_master\Torch\VRageGame.cs:line 130
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()