From 779fe97738c9351495a1b11dede46768b56f71d5 Mon Sep 17 00:00:00 2001
From: Igor Bukanov <igor@mir2.org>
Date: Wed, 26 Nov 2008 10:16:48 -0800
Subject: [PATCH] bug 457521, r=brendan a191=blocking

---
 js/src/jsopcode.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/src/jsopcode.cpp b/js/src/jsopcode.cpp
index a3227dcd830e..6e50aa63a268 100644
--- a/js/src/jsopcode.cpp
+++ b/js/src/jsopcode.cpp
@@ -4948,7 +4948,7 @@ 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;