From b4b3776b8dbb2f2b9da9d4bf15ca04793e6a44d3 Mon Sep 17 00:00:00 2001
From: "dougt%netscape.com"
 <dougt%netscape.com@18797224-902f-48f8-a5cc-f745e15eee43>
Date: Sat, 27 Oct 2001 03:06:09 +0000
Subject: [PATCH] check for null.  if the reference ever goes away, we crash

git-svn-id: svn://10.0.0.236/trunk@106447 18797224-902f-48f8-a5cc-f745e15eee43
---
 mozilla/xpcom/ds/nsObserverList.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mozilla/xpcom/ds/nsObserverList.cpp b/mozilla/xpcom/ds/nsObserverList.cpp
index 1aa61b5f843..cfb31ebc045 100644
--- a/mozilla/xpcom/ds/nsObserverList.cpp
+++ b/mozilla/xpcom/ds/nsObserverList.cpp
@@ -196,7 +196,7 @@ ObserverListEnumerator::GetNext(nsISupports** aResult)
         if ( weakRefFactory ) {
             nsCOMPtr<nsISupports> weakref = do_QueryReferent(weakRefFactory);
             NS_RELEASE(*aResult);
-            NS_ADDREF(*aResult = weakref);
+            NS_IF_ADDREF(*aResult = weakref);
 
             return NS_OK;
         }