diff --git a/src/com/android/settings/deviceinfo/MemoryMeasurement.java b/src/com/android/settings/deviceinfo/MemoryMeasurement.java
index 1b42bc10df2..dfe60cecf0b 100644
--- a/src/com/android/settings/deviceinfo/MemoryMeasurement.java
+++ b/src/com/android/settings/deviceinfo/MemoryMeasurement.java
@@ -425,7 +425,7 @@ public class MemoryMeasurement {
             File top = Environment.getExternalStorageDirectory();
             mFileInfoForMisc = new ArrayList<FileInfo>();
             File[] files = top.listFiles();
-            int len = files.length;
+            int len = files != null ? files.length : 0;
             if (len == 0) {
                 return;
             }