Receive FCM Push Notification Multiple time automatically. How to stop it?

I am using Firebase in my app for chat. but when I send one message that I receive single notification. it's ok. But after 2-3 minutes I will start receiving all old notifications one by one. here is my code for receiving. I remove all code for notification handling but after that, I still received notification repeatedly:--

public class FirebaseNotificationReceiver extends WakefulBroadcastReceiver {
    private final String NOTIFICATION_BODY_KEY = "gcm.notification.body";

    @Override
    public void onReceive(Context context, Intent intent) {
        Log.e("NOTIFICATION RECEIVED", "RECEIVED");
    }

in menifest:

     <receiver
        android:name=".firebase.FirebaseNotificationReceiver"
        android:exported="true"
        android:permission="com.google.android.c2dm.permission.SEND">
        <intent-filter>
            <action         android:name="com.google.android.c2dm.intent.RECEIVE" />
        </intent-filter>
    </receiver>