From bdd079e76d8857bb6834ee61bf8153cf0c1ea0c9 Mon Sep 17 00:00:00 2001
From: Pierre Kraemer <kraemer@unistra.fr>
Date: Wed, 21 Nov 2012 10:24:06 +0100
Subject: [PATCH] map.begin() -> bug in MR mode when called on empty map

---
 include/Topology/generic/genericmap.hpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/Topology/generic/genericmap.hpp b/include/Topology/generic/genericmap.hpp
index 1fb4425c..c19fe106 100644
--- a/include/Topology/generic/genericmap.hpp
+++ b/include/Topology/generic/genericmap.hpp
@@ -560,8 +560,11 @@ inline Dart GenericMap::begin() const
 	if (m_isMultiRes)
 	{
 		unsigned int d = m_mrattribs.begin() ;
-		while (getDartLevel(d) > m_mrCurrentLevel)
-			m_mrattribs.next(d) ;
+		if(d != m_mrattribs.end())
+		{
+			while (getDartLevel(d) > m_mrCurrentLevel)
+				m_mrattribs.next(d) ;
+		}
 		return Dart::create(d) ;
 	}
 
-- 
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