diff --git a/app/src/main/java/com/fongmi/android/tv/utils/Util.java b/app/src/main/java/com/fongmi/android/tv/utils/Util.java
index d4311ddd7..978d4c759 100644
--- a/app/src/main/java/com/fongmi/android/tv/utils/Util.java
+++ b/app/src/main/java/com/fongmi/android/tv/utils/Util.java
@@ -116,6 +116,7 @@ public class Util {
         try {
             StringBuilder sb = new StringBuilder();
             NetworkInterface nif = NetworkInterface.getByName(name);
+            if (nif.getHardwareAddress() == null) return "";
             for (byte b : nif.getHardwareAddress()) sb.append(String.format("%02X:", b));
             return substring(sb.toString());
         } catch (Exception e) {