From e7ef84b2c2826d60850ad9c8b0f6983033f4c87c Mon Sep 17 00:00:00 2001
From: Maria Dimashova <no@email>
Date: Fri, 29 Apr 2011 17:12:55 +0000
Subject: [PATCH] fixed #932

---
 modules/features2d/src/matchers.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/modules/features2d/src/matchers.cpp b/modules/features2d/src/matchers.cpp
index 6c1e9fb0a..ff3a3aabb 100755
--- a/modules/features2d/src/matchers.cpp
+++ b/modules/features2d/src/matchers.cpp
@@ -914,7 +914,8 @@ void OneWayDescriptorMatcher::clear()
     GenericDescriptorMatcher::clear();
 
     prevTrainCount = 0;
-    base->clear();
+    if( !base.empty() )
+        base->clear();
 }
 
 void OneWayDescriptorMatcher::train()