diff --git a/foudations/mogo-base-websocket-sdk/src/main/java/com/mogo/base/websocket/WebSocketManager.java b/foudations/mogo-base-websocket-sdk/src/main/java/com/mogo/base/websocket/WebSocketManager.java
index f80e249d3e..eafa6edacf 100644
--- a/foudations/mogo-base-websocket-sdk/src/main/java/com/mogo/base/websocket/WebSocketManager.java
+++ b/foudations/mogo-base-websocket-sdk/src/main/java/com/mogo/base/websocket/WebSocketManager.java
@@ -142,8 +142,10 @@ public class WebSocketManager implements IMogoWebSocketManager, ISocketMsgSettin
             webSocketData.setSn(Utils.getSn());
             webSocketData.setData(GsonUtil.jsonFromObject(body));
             MogoLocation lastKnown = MogoApisHandler.getInstance().getApis().getMapServiceApi().getSingletonLocationClient(context).getLastKnowLocation();
-            if (lastKnown != null) {
+            if (lastKnown != null&&!lastKnown.getCityCode().isEmpty()) {
                 webSocketData.setCityCode(lastKnown.getCityCode());
+            }else{
+                webSocketData.setCityCode(null);
             }
             String msg = GsonUtil.jsonFromObject(webSocketData);
             Logger.d(TAG,"sendMsg : " + msg);