This crash happens very often on DS when you try to fast travel or teleport to a player that is far away from your current location.
I am not sure if it has to do with the amount of grids in that area, but it seems to crash more often when that's the case.

Exception occurred: System.NullReferenceException: Object reference not set to an instance of an object.
at VRage.Scene.EntityId.VRage.Scene.IMyObjectIdentifier.TryGetObject(Object scene, Object& instance)
at VRage.Scene.MyGroupSynchronizationExtensions.RemoveEntityClient(MyGroup self, TypeId interfaceType, IMyObjectIdentifier entityId)
at lambda_method(Closure , MyGroup , TypeId , IMyObjectIdentifier , DBNull , DBNull , DBNull , DBNull )
at VRage.Network.CallSite7.Invoke(BitStream stream, Object obj, Boolean validate) at VRage.Network.MyReplicationLayer.Invoke(CallSite callSite, BitStream stream, Object obj, EndpointId source, MyClientStateBase clientState, Boolean validate) at VRage.Network.MyReplicationClient.ProcessEvent(BitStream stream, CallSite site, Object obj, IMyNetObject sendAs, EndpointId source) at VRage.Network.MyReplicationLayer.ProcessEvent(BitStream stream, NetworkId networkId, NetworkId blockedNetId, UInt32 eventId, EndpointId sender) at VRage.Replication.MyEventsBuffer.ProcessFirstEvent(HashSet1 targetObjectIds, MyObjectEventsBuffer eventsBuffer, NetworkId targetObjectId, NetworkId caller)
at VRage.Replication.MyEventsBuffer.ProcessEvents(HashSet1 targetObjectIds, NetworkId caller) at VRage.Replication.MyEventsBuffer.ProcessFirstEvent(HashSet1 targetObjectIds, MyObjectEventsBuffer eventsBuffer, NetworkId targetObjectId, NetworkId caller)
at VRage.Replication.MyEventsBuffer.ProcessEvents(HashSet1 targetObjectIds, NetworkId caller) at VRage.Replication.MyReplicableStreamingReceiver.OnReplicablesAddedToScene(DictionaryReader2 replicableLoadResults)
at Sandbox.Engine.Multiplayer.MyClientSceneLoader.VRage.Scene.ISceneLoadListener.OnAddedToScene()
at VRage.Scene.MySceneExtensions.MySceneLoadWork.Completed()
at VRage.ParallelWorkers.Workers.RunCallbacks()
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)