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[SFS - ERROR] Error handling data: Error dispatching event userVariablesUpdate: Object reference not set to an instance of an object.    at WP8Game.SFSControl.HandleUserVariableUpdate(BaseEvent evt)
   at Sfs2X.Core.EventDispatcher.DispatchEvent(BaseEvent evt)    at Sfs2X.Core.EventDispatcher.DispatchEvent(BaseEvent evt)
   at Sfs2X.SmartFox.DispatchEvent(BaseEvent evt)
   at Sfs2X.Controllers.SystemController.FnSetUserVariables(IMessage msg)
   at Sfs2X.Controllers.SystemController.HandleMessage(IMessage message)
   at Sfs2X.Core.SFSProtocolCodec.DispatchRequest(ISFSObject requestObject)
   at Sfs2X.Core.SFSProtocolCodec.OnPacketRead(ByteArray packet)
   at Sfs2X.Core.SFSIOHandler.HandlePacketData(ByteArray data)

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SFSControl()
        {
            initSmartFox();
            addEventHandler();
        }

        public static SFSControl Instance
        {
            get
            {
                lock (padLock)
                {
                    if (instance == null)
                    {
                        instance = new SFSControl();
                    }
                    return instance;
                }
            }
        }

        public void initSmartFox()
        {
            sfsClient = new SmartFox();
            sfsClient.Debug = true;
            sfsClient.ThreadSafeMode = false;
            sfsClient.Logger.LoggingLevel = Sfs2X.Logging.LogLevel.INFO;
        }

        private void addEventHandler()
        {
            //System.Windows.MessageBox.Show("event added");
            sfsClient.AddEventListener(SFSEvent.CONNECTION, OnConnection);
            sfsClient.AddEventListener(SFSEvent.CONNECTION_LOST, OnConnectionLost);
            sfsClient.AddEventListener(SFSEvent.LOGIN, OnLogin);
........
            sfsClient.AddEventListener(SFSEvent.ROOM_VARIABLES_UPDATE, HandleRoomVariableUpdate);
            sfsClient.AddEventListener(SFSEvent.USER_VARIABLES_UPDATE, HandleUserVariableUpdate);

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 public void HandleRoomVariableUpdate(BaseEvent evt)
        {
            List<string> rvs = (List<string>)evt.Params["changedVars"];
            for (int i = 0; i < rvs.Count; i++)
            {
                string cmd = rvs.ElementAt(i);
                handleRoomVariableUpdate(cmd);
            }
        }