diff --git a/iot-module/iot-plugin/iot-plugin-main/src/main/java/cc/iotkit/plugin/main/ThingServiceImpl.java b/iot-module/iot-plugin/iot-plugin-main/src/main/java/cc/iotkit/plugin/main/ThingServiceImpl.java
index 3482b45e..303dc6d7 100644
--- a/iot-module/iot-plugin/iot-plugin-main/src/main/java/cc/iotkit/plugin/main/ThingServiceImpl.java
+++ b/iot-module/iot-plugin/iot-plugin-main/src/main/java/cc/iotkit/plugin/main/ThingServiceImpl.java
@@ -84,9 +84,11 @@ public class ThingServiceImpl implements IThingService {
             DeviceInfo device = getDeviceInfo(deviceName);
             if (device == null) {
                 log.warn("device:{} is not found.", deviceName);
+            }else {
+                long lastTime = System.currentTimeMillis();
+                deviceUpdateLastTime(device, lastTime);
             }
-            long lastTime = System.currentTimeMillis();
-            deviceUpdateLastTime(device, lastTime);
+
 
             ActionType type = action.getType();
             switch (type) {