diff --git a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
index d558dd60..5d323611 100644
--- a/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
+++ b/mpmaster/src/main/java/com/xypower/mpmaster/MpMasterService.java
@@ -484,7 +484,10 @@ public class MpMasterService extends Service {
                 if (!mService.mSeparateNetwork || (mService.mMntnMode || mService.mQuickHbMode)) {
                     mService.logger.info("Heartbeat Timer Fired By MpAPP ACTION=" + action);
 
-                    mService.registerHeartbeatTimer(mService.mPreviousHeartbeatTime + mService.mHeartbeatDuration * 1000);
+                    long ts = System.currentTimeMillis();
+                    if (mService.mPreviousHeartbeatTime - ts < mService.mHeartbeatDuration * 1000) {
+                        mService.registerHeartbeatTimer(mService.mPreviousHeartbeatTime + mService.mHeartbeatDuration * 1000);
+                    }
 
                     mService.startMaster(true);
                     mService.startMpApp();