diff --git a/app/build.gradle b/app/build.gradle
index ae3122f1a..8794c7f46 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -22,7 +22,7 @@ android {
         leanback {
             dimension "mode"
             versionCode 75
-            versionName "20230505#3"
+            versionName "20230505#4"
         }
         mobile {
             dimension "mode"
diff --git a/app/src/main/java/com/fongmi/android/tv/utils/FileUtil.java b/app/src/main/java/com/fongmi/android/tv/utils/FileUtil.java
index e81121d24..4e36223ed 100644
--- a/app/src/main/java/com/fongmi/android/tv/utils/FileUtil.java
+++ b/app/src/main/java/com/fongmi/android/tv/utils/FileUtil.java
@@ -208,10 +208,11 @@ public class FileUtil {
         return TextUtils.isEmpty(mimeType) ? "*/*" : mimeType;
     }
 
-    private static long getFolderSize(File f) {
+    private static long getFolderSize(File file) {
         long size = 0;
-        if (f.isDirectory()) for (File file : f.listFiles()) size += getFolderSize(file);
-        else size = f.length();
+        if (file == null) return 0;
+        if (file.isDirectory()) for (File f : file.listFiles()) size += getFolderSize(f);
+        else size = file.length();
         return size;
     }