From 284837daa07b29d6a63a748544a90b1f5842ac5c Mon Sep 17 00:00:00 2001
From: Simon Hausmann <simon.hausmann@nokia.com>
Date: Mon, 10 Sep 2012 19:10:20 +0200
Subject: Imported WebKit commit 68645295d2e3e09af2c942f092556f06aa5f8b0d
 (http://svn.webkit.org/repository/webkit/trunk@128073)

New snapshot
---
 Source/JavaScriptCore/heap/MarkStack.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

(limited to 'Source/JavaScriptCore/heap/MarkStack.cpp')

diff --git a/Source/JavaScriptCore/heap/MarkStack.cpp b/Source/JavaScriptCore/heap/MarkStack.cpp
index 9d3062154..9a4a01f04 100644
--- a/Source/JavaScriptCore/heap/MarkStack.cpp
+++ b/Source/JavaScriptCore/heap/MarkStack.cpp
@@ -35,10 +35,9 @@
 #include "JSArray.h"
 #include "JSCell.h"
 #include "JSObject.h"
-#include "ScopeChain.h"
+
 #include "SlotVisitorInlineMethods.h"
 #include "Structure.h"
-#include "UString.h"
 #include "WriteBarrier.h"
 #include <wtf/Atomics.h>
 #include <wtf/DataLog.h>
@@ -523,6 +522,8 @@ ALWAYS_INLINE void MarkStack::internalAppend(JSValue* slot)
         return;
 
     JSCell* cell = value.asCell();
+    if (!cell)
+        return;
 
     if (m_shouldHashConst && cell->isString()) {
         JSString* string = jsCast<JSString*>(cell);
-- 
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