When placing catch blocks with the moving component aligned to the same grid as the catch block is placed on the game crashes.
This isn't present with any vanilla catch block (since they aren't aligned), but is present on modded catch blocks such as Peaceman's More Catch Blocks.

Exception occurred: System.NullReferenceException: Object reference not set to an instance of an object.
   at Havok.HkLimitedHingeConstraintData.GetRuntime(HkConstraint constraint)
   at Havok.HkLimitedHingeConstraintData.SetCurrentAngle(HkConstraint constraint, Single value)
   at Medieval.Entities.Components.Mechanical.MyHingeConstraint.OnActivate(MyPhysicsComponentBase left, MyPhysicsComponentBase right)
   at VRage.Components.Physics.MyConstraint.Activate(MyPhysicsComponentBase left, MyPhysicsComponentBase right)
   at VRage.Components.Physics.MyPhysicsConstraintGroup.Activate(MyConstraint constraint, MyPhysicsComponentBase left, MyPhysicsComponentBase right)
   at VRage.Components.Physics.MyPhysicsConstraintGroup.AddLink(MyConstraintAttachmentComponent left, MyConstraintAttachmentComponent right, MyConstraint constraint)
   at VRage.Scene.MyScene.GroupAddDataLinkInternal[TGroup,TObject,TLink](TGroup group, TObject left, TObject right, TLink link)
   at VRage.Scene.MyScene.GroupAddDataLinkSynchronized[TGroup,TObject,TLink](TGroup group, TObject left, TObject right, TLink link)
   at VRage.Scene.MyScene.Link[TGroup,TObject,TLink](TObject left, TObject right, TLink link)
   at VRage.Components.Physics.MyPhysicsConstraintGroup.RedoConnection(MyConstraintAttachmentComponent left, MyConstraintAttachmentComponent right)
   at VRage.Scene.MyTieredComponentGroup`2.ChildOnParentChange(MyHierarchyComponent target, MyHierarchyComponent oldParent, MyHierarchyComponent newParent)
   at VRage.Game.Components.MyHierarchyComponent.ParentChangedEvent.Invoke(MyHierarchyComponent target, MyHierarchyComponent oldParent, MyHierarchyComponent newParent)
   at VRage.Game.Components.MyHierarchyComponent.RaiseParentChange(MyHierarchyComponent previous, MyHierarchyComponent current)
   at VRage.Game.Components.MyHierarchyComponent.AddChild(MyEntity child, Boolean worldSpaceTransform, Boolean delayedActivation)
   at VRage.Components.Entity.CubeGrid.MyGridHierarchyComponent.OnAfterMerge(MyGridDataComponent finalGridData, MyGridDataComponent otherGridData, List`1 thisBlocks, List`1 otherBlocks)
   at VRage.Components.Entity.CubeGrid.MyGridDataComponent.AfterMergeDelegate.Invoke(MyGridDataComponent finalGridData, MyGridDataComponent otherGridData, List`1 thisBlocks, List`1 otherBlocks)
   at VRage.Components.Entity.CubeGrid.MyGridDataComponent.Merge(MyGridDataComponent otherGridData)
   at Medieval.GameSystems.Building.MyGridPlacer.PerformMerge(MyGridDataComponent gridData1, MyGridDataComponent gridData2)
   at Medieval.GameSystems.Building.MyGridPlacer.DetermineGridMerges(List`1 createdScenes, Boolean autoMergeEnvironment, List`1 outputEntities)
   at Medieval.GameSystems.Building.MyGridPlacer.Server_BuildRequest(MyBuildServerRequest buildRequest)
   at lambda_method(Closure , MyGridPlacer , MyBuildServerRequest , DBNull , DBNull , DBNull , DBNull , DBNull )
   at VRage.Network.MyReplicationLayerBase.InvokeLocally[T1,T2,T3,T4,T5,T6,T7](CallSite`7 site, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7)
   at VRage.Network.MyReplicationSingle.DispatchEvent[T1,T2,T3,T4,T5,T6,T7,T8](CallSite callSite, EndpointId recipient, Single unreliablePriority, T1& arg1, T2& arg2, T3& arg3, T4& arg4, T5& arg5, T6& arg6, T7& arg7, T8& arg8)
   at VRage.Network.MyReplicationLayerBase.RaiseEvent[T1,T2,T3](T1 arg1, T3 arg3, Func`2 action, T2 arg2, EndpointId endpointId, Single unreliablePriority)
   at Medieval.GameSystems.Building.MyGridPlacer.BuildingPlaceInternal()
   at Medieval.GameSystems.Building.MyGridPlacer.BuildingPlace(ActionEvent& action)
   at VRage.Input.MyFocusManager.Update()
   at VRage.Input.MyGameInput.Update(MyTimeSpan gameTime)
   at Sandbox.MySandboxGame.Update()
   at Sandbox.Engine.Platform.Game.UpdateInternal()
   at Sandbox.Engine.Platform.Game.RunSingleFrame()
   at VRage.Components.MyUpdateScheduler.RunFixedUpdates()
   at VRage.Components.MyUpdateScheduler.RunUpdates(TimeSpan currentTime)
   at Sandbox.Engine.Platform.MySandboxUpdate.<RunLoop>b__18_0()
   at VRage.Utils.FixedLoop.Run(Action tickCallback)
   at Sandbox.Engine.Platform.MySandboxUpdate.RunLoop()
   at Medieval.MyProgram.Main(String[] args)