From cad0261e557632464452bf667fa8ea3a8002fd1f Mon Sep 17 00:00:00 2001
From: Artem Pavlenko <artem@mapnik.org>
Date: Tue, 31 Jan 2012 09:45:06 +0000
Subject: [PATCH] check if index is valid before pushing back value.

---
 include/mapnik/feature.hpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/mapnik/feature.hpp b/include/mapnik/feature.hpp
index 3f788e27a..082bb43b3 100644
--- a/include/mapnik/feature.hpp
+++ b/include/mapnik/feature.hpp
@@ -143,7 +143,8 @@ public:
         else
         {
             cont_type::size_type index = ctx_->push(key);
-            data_.push_back(val);
+            if (index == data_.size())
+                data_.push_back(val);
         }
     }