From 77e3fcc5964bb24d44e3a362a82a80bca4f9d43b Mon Sep 17 00:00:00 2001
From: cristy <urban-warrior@git.imagemagick.org>
Date: Tue, 11 Oct 2011 00:04:41 +0000
Subject: [PATCH]

---
 MagickCore/string.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/MagickCore/string.c b/MagickCore/string.c
index fa6eeebba..621eb2bcd 100644
--- a/MagickCore/string.c
+++ b/MagickCore/string.c
@@ -734,6 +734,8 @@ MagickExport size_t CopyMagickString(char *destination,const char *source,
   register size_t
     n;
 
+  if (source == (const char *) NULL)
+    return(0);
   p=source;
   q=destination;
   for (n=length; n > 4; n-=4)
-- 
2.40.0