diff --git a/xhpc-modules/xhpc-power-pile/src/main/java/com/xhpc/pp/server/ChargingPileEventHandler.java b/xhpc-modules/xhpc-power-pile/src/main/java/com/xhpc/pp/server/ChargingPileEventHandler.java
index 5a87105b..856dc270 100644
--- a/xhpc-modules/xhpc-power-pile/src/main/java/com/xhpc/pp/server/ChargingPileEventHandler.java
+++ b/xhpc-modules/xhpc-power-pile/src/main/java/com/xhpc/pp/server/ChargingPileEventHandler.java
@@ -32,10 +32,12 @@ public class ChargingPileEventHandler implements ClientEventHandler {
     public void lostConnection(ClientHandler handler) {
 
         String pileNo = ChargingPileServer.getPileNo(handler);
-        String pkey = "pile:".concat(pileNo);
-        Map<String, Object> cachePile = REDIS.getCacheMap(pkey);
-        cachePile.put("status", RegisterLogic.DISCONNECTED);
-        REDIS.setCacheMap(pkey, cachePile);
+        if (pileNo != null) {
+            String pkey = "pile:".concat(pileNo);
+            Map<String, Object> cachePile = REDIS.getCacheMap(pkey);
+            cachePile.put("status", RegisterLogic.DISCONNECTED);
+            REDIS.setCacheMap(pkey, cachePile);
+        }
         log.info("-> ({}) - [{}] <- {}",
                 pileNo, handler.getName(), handler.getSocket().getRemoteSocketAddress().toString());
     }