From c6cb6a40d4862ddde73a1cda92ab8d566fe8bd85 Mon Sep 17 00:00:00 2001
From: "reed%reedloden.com"
 <reed%reedloden.com@18797224-902f-48f8-a5cc-f745e15eee43>
Date: Tue, 3 Feb 2009 09:25:56 +0000
Subject: [PATCH] Bug 457521 - [p=igor@mir2.org (Igor Bukanov) r=crowder
 a=dveditz]

git-svn-id: svn://10.0.0.236/trunk@256058 18797224-902f-48f8-a5cc-f745e15eee43
---
 mozilla/js/src/jsopcode.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mozilla/js/src/jsopcode.c b/mozilla/js/src/jsopcode.c
index b2e03dd3404..55d59b0078a 100644
--- a/mozilla/js/src/jsopcode.c
+++ b/mozilla/js/src/jsopcode.c
@@ -4824,7 +4824,7 @@ js_DecompileValueGenerator(JSContext *cx, intN spindex, jsval v,
 
     for (fp = cx->fp; fp && !fp->script; fp = fp->down)
         continue;
-    if (!fp || !fp->regs)
+    if (!fp || !fp->regs || !fp->regs->sp)
         goto do_fallback;
 
     script = fp->script;