From c1deb226f4d1bc94c158c050088813aae96775e9 Mon Sep 17 00:00:00 2001
From: Dhammika Pathirana <dhammika@gmail.com>
Date: Tue, 28 Sep 2010 07:46:17 +0200
Subject: crash when closing an ypipe -- fixed

---
 src/ypipe.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/ypipe.hpp b/src/ypipe.hpp
index 26f021c..1785b71 100644
--- a/src/ypipe.hpp
+++ b/src/ypipe.hpp
@@ -127,7 +127,7 @@ namespace zmq
         inline bool check_read ()
         {
             //  Was the value prefetched already? If so, return.
-            if (&queue.front () != r)
+            if (&queue.front () != r && r)
                  return true;
 
             //  There's no prefetched value, so let us prefetch more values.
-- 
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