diff --git a/app/build.gradle b/app/build.gradle
index 83b03d1ca..7ac0e9dc5 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -116,7 +116,7 @@ dependencies {
     implementation 'com.google.android.material:material:1.9.0'
     implementation 'com.google.code.gson:gson:' + gsonVersion
     implementation 'com.google.net.cronet:cronet-okhttp:0.1.0'
-    implementation 'com.google.zxing:core:3.4.1'
+    implementation 'com.google.zxing:core:3.3.0'
     implementation 'com.guolindev.permissionx:permissionx:1.7.1'
     implementation 'com.hierynomus:smbj:0.11.5'
     implementation 'com.squareup.okhttp3:okhttp:' + okhttpVersion
diff --git a/app/src/main/java/com/fongmi/android/tv/utils/Clock.java b/app/src/main/java/com/fongmi/android/tv/utils/Clock.java
index b1bf2bede..359a3eb03 100644
--- a/app/src/main/java/com/fongmi/android/tv/utils/Clock.java
+++ b/app/src/main/java/com/fongmi/android/tv/utils/Clock.java
@@ -32,7 +32,7 @@ public class Clock {
     }
 
     public static void stop() {
-        get().release();
+        if (get().timer != null) get().timer.cancel();
     }
 
     public static void start() {
@@ -52,6 +52,11 @@ public class Clock {
         this.callback = callback;
     }
 
+    public void release() {
+        if (timer != null) timer.cancel();
+        if (callback != null) callback = null;
+    }
+
     private void run(TextView view) {
         timer = new Timer();
         timer.schedule(new TimerTask() {
@@ -71,11 +76,6 @@ public class Clock {
         }
     }
 
-    public void release() {
-        if (timer != null) timer.cancel();
-        if (callback != null) callback = null;
-    }
-
     public interface Callback {
 
         void onTimeChanged();