diff --git a/core/java/android/app/Notification.java b/core/java/android/app/Notification.java
index 9834c75c58d4b..05f769e94c271 100644
--- a/core/java/android/app/Notification.java
+++ b/core/java/android/app/Notification.java
@@ -458,7 +458,9 @@ public class Notification implements Parcelable
                 sb.append(this.vibrate[i]);
                 sb.append(',');
             }
-            sb.append(this.vibrate[N]);
+	    if (N != -1) {
+        	sb.append(this.vibrate[N]);
+	    }
             sb.append("]");
         } else if ((this.defaults & DEFAULT_VIBRATE) != 0) {
             sb.append("default");