Index: mitkSurface.cpp
===================================================================
--- mitkSurface.cpp	(revision 27265)
+++ mitkSurface.cpp	(working copy)
@@ -65,6 +65,8 @@
 
   if(m_PolyDataSeries[ t ] != NULL)
   {
+    if ( m_PolyDataSeries[ t ] == polydata )
+      return;
     // we do not need the reference on the object any longer
     m_PolyDataSeries[ t ]->Delete();
   }