diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
index a905539b..51b4a472 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
@@ -648,7 +648,11 @@ public class MpMasterService extends Service {
                 String appPath = MicroPhotoContext.buildAppDir(this.getApplicationContext());
 
                 String cmdid = intent.getStringExtra("cmdid");
-                mCmdid = cmdid;
+                if (TextUtils.isEmpty(cmdid)) {
+                    mCmdid = SysApi.getSerialNo(getApplicationContext());
+                } else {
+                    mCmdid = cmdid;
+                }
 
                 Log.i(TAG, "AppPath=" + appPath + " cmdid=" + cmdid);