From 2f94a2c919ddb39f33c47b4baa7bd37e2ae4cacd Mon Sep 17 00:00:00 2001
From: Bill Hoffman <bill.hoffman@kitware.com>
Date: Wed, 21 Oct 2009 09:04:50 -0400
Subject: Fix seg fault for empty ENV{} call bug #9747

---
 Source/cmCommandArgumentParserHelper.cxx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/Source/cmCommandArgumentParserHelper.cxx b/Source/cmCommandArgumentParserHelper.cxx
index ace67ec..234c37e 100644
--- a/Source/cmCommandArgumentParserHelper.cxx
+++ b/Source/cmCommandArgumentParserHelper.cxx
@@ -65,7 +65,11 @@ char* cmCommandArgumentParserHelper::ExpandSpecialVariable(const char* key,
   if ( !key )
     {
     return this->ExpandVariable(var);
-    } 
+    }
+  if(!var)
+    {
+    return this->EmptyVariable;
+    }
   if ( strcmp(key, "ENV") == 0 )
     {
     char *ptr = getenv(var);
-- 
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