21:01:04.2433 [FATAL]  Initializer: System.InvalidOperationException: Handle is not initialized.
   at System.Runtime.InteropServices.GCHandle.FromIntPtr(IntPtr value)
   at gcroot<Havok::HkConstraint ^>..PE$AAVHkConstraint@Havok@@(gcroot<Havok::HkConstraint ^>* )
   at Havok.HkConstraint.GetAttachedConstraints(HkRigidBody rigidBody, List`1 constraintsOut)
   at Sandbox.Engine.Physics.MyPhysicsBody.NotifyConstraintsRemovedFromWorld()
   at Sandbox.Game.Entities.Cube.MyGridPhysics.ConvertToStatic()
   at Sandbox.Game.Entities.MyCubeGrid.UpdateBeforeSimulation()
   at <UpdateBeforeSimulation>b__7_0(MyEntity )
   at VRage.Collections.MyDistributedUpdater`2.Iterate(Action`1 p)
   at Sandbox.Game.Entities.MyEntities.UpdateBeforeSimulation()
   at Sandbox.Game.World.MySector.UpdateBeforeSimulation()
   at UpdateComponents_0(Object )
   at Sandbox.Game.World.MySession.Update(MyTimeSpan updateTime)
   at Sandbox.MySandboxGame.Update()
   at Sandbox.Engine.Platform.Game.UpdateInternal()
   at RunSingleFrame_0(Object )
   at Sandbox.Engine.Platform.FixedLoop.<>c__DisplayClass1.<Run>b__0()
   at Sandbox.Engine.Platform.GenericLoop.Run(VoidAction tickCallback)
   at Sandbox.Engine.Platform.Game.RunLoop()
   at Sandbox.MySandboxGame.Run(Boolean customRenderLoop, Action disposeSplashScreen)
   at Torch.VRageGame.DoStart()
   at Torch.VRageGame.Run()
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()
System.InvalidOperationException: Handle is not initialized.
   at System.Runtime.InteropServices.GCHandle.FromIntPtr(IntPtr value)
   at gcroot<Havok::HkConstraint ^>..PE$AAVHkConstraint@Havok@@(gcroot<Havok::HkConstraint ^>* )
   at Havok.HkConstraint.GetAttachedConstraints(HkRigidBody rigidBody, List`1 constraintsOut)
   at Sandbox.Engine.Physics.MyPhysicsBody.NotifyConstraintsRemovedFromWorld()
   at Sandbox.Game.Entities.Cube.MyGridPhysics.ConvertToStatic()
   at Sandbox.Game.Entities.MyCubeGrid.UpdateBeforeSimulation()
   at <UpdateBeforeSimulation>b__7_0(MyEntity )
   at VRage.Collections.MyDistributedUpdater`2.Iterate(Action`1 p)
   at Sandbox.Game.Entities.MyEntities.UpdateBeforeSimulation()
   at Sandbox.Game.World.MySector.UpdateBeforeSimulation()
   at UpdateComponents_0(Object )
   at Sandbox.Game.World.MySession.Update(MyTimeSpan updateTime)
   at Sandbox.MySandboxGame.Update()
   at Sandbox.Engine.Platform.Game.UpdateInternal()
   at RunSingleFrame_0(Object )
   at Sandbox.Engine.Platform.FixedLoop.<>c__DisplayClass1.<Run>b__0()
   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()
   at Torch.VRageGame.Run()
   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()