From 6f26c55fe36024e67fb32cbbaf7ac918fec98fea Mon Sep 17 00:00:00 2001
From: Vadim Pisarevsky <no@email>
Date: Mon, 13 Jun 2011 21:23:42 +0000
Subject: [PATCH] fixed ticket #983

---
 modules/core/src/persistence.cpp | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/modules/core/src/persistence.cpp b/modules/core/src/persistence.cpp
index 04528c006b..64097e6a69 100644
--- a/modules/core/src/persistence.cpp
+++ b/modules/core/src/persistence.cpp
@@ -4790,9 +4790,12 @@ cvTypeOf( const void* struct_ptr )
 {
     CvTypeInfo* info = 0;
 
-    for( info = CvType::first; info != 0; info = info->next )
-        if( info->is_instance( struct_ptr ))
-            break;
+    if( struct_ptr )
+    {
+        for( info = CvType::first; info != 0; info = info->next )
+            if( info->is_instance( struct_ptr ))
+                break;
+    }
 
     return info;
 }