diff --git a/services/usb/java/com/android/server/usb/UsbAlsaManager.java b/services/usb/java/com/android/server/usb/UsbAlsaManager.java
index 8f0c6c8f27c5b..daccf959cadb8 100644
--- a/services/usb/java/com/android/server/usb/UsbAlsaManager.java
+++ b/services/usb/java/com/android/server/usb/UsbAlsaManager.java
@@ -142,8 +142,10 @@ public final class UsbAlsaManager {
 
         // add existing alsa devices
         File[] files = new File(ALSA_DIRECTORY).listFiles();
-        for (int i = 0; i < files.length; i++) {
-            alsaFileAdded(files[i].getName());
+        if (files != null) {
+            for (int i = 0; i < files.length; i++) {
+                alsaFileAdded(files[i].getName());
+            }
         }
     }