--- a/mobile/android/base/java/org/mozilla/gecko/telemetry/stores/TelemetryJSONFilePingStore.java
+++ b/mobile/android/base/java/org/mozilla/gecko/telemetry/stores/TelemetryJSONFilePingStore.java
@@ -124,17 +124,25 @@ public class TelemetryJSONFilePingStore 
             // Sorted set so we're iterating over ascending files.
             final File file = it.next(); // file count > files to remove so this should not throw.
             file.delete();
         }
     }
 
     @Override
     public ArrayList<TelemetryPing> getAllPings() {
-        final List<File> files = Arrays.asList(storeDir.listFiles(uuidFilenameFilter));
+        final File[] fileArray = storeDir.listFiles(uuidFilenameFilter);
+        if (fileArray == null) {
+            // Intentionally don't log all info for the store directory to prevent leaking the path.
+            Log.w(LOGTAG, "listFiles unexpectedly returned null - unable to retrieve pings. Debug: exists? " +
+                    storeDir.exists() + "; directory? " + storeDir.isDirectory());
+            return new ArrayList<>(1);
+        }
+
+        final List<File> files = Arrays.asList(fileArray);
         Collections.sort(files, fileLastModifiedComparator); // oldest to newest
         final ArrayList<TelemetryPing> out = new ArrayList<>(files.size());
         for (final File file : files) {
             final JSONObject obj = lockAndReadJSONFromFile(file);
             if (obj == null) {
                 // We log in the method to get the JSONObject if we return null.
                 continue;
             }