Bug 516124 - Crash [@ nsAlertsIconListener::SendClosed], r=roc.

toolkit/components/alerts/test/test_alerts.html

@@ -33,6 +33,8 @@ const Ci = Components.interfaces;
 try {
   var notifier = Cc["@mozilla.org/alerts-service;1"].
                  getService(Ci.nsIAlertsService);
+  notifier.showAlertNotification(null, "Notification test", "Surprise! I'm here to test a notification without observer!",
+                                 false, "foobarcookie", null);
   notifier.showAlertNotification(null, "Notification test", "Surprise! I'm here to test notifications!",
                                  false, "foobarcookie", observer);
 

toolkit/system/gnome/nsAlertsIconListener.cpp

@@ -250,13 +250,17 @@ nsAlertsIconListener::StartRequest(const nsAString & aImageUrl)
 void
 nsAlertsIconListener::SendCallback()
 {
-  mAlertListener->Observe(NULL, "alertclickcallback", mAlertCookie.get());
+  if (mAlertListener) {
+    mAlertListener->Observe(NULL, "alertclickcallback", mAlertCookie.get());
+  }
 }
 
 void
 nsAlertsIconListener::SendClosed()
 {
-  mAlertListener->Observe(NULL, "alertfinished", mAlertCookie.get());
+  if (mAlertListener) {
+    mAlertListener->Observe(NULL, "alertfinished", mAlertCookie.get());
+  }
 }
 
 nsresult