Index: Core/Code/Rendering/mitkVtkPropRenderer.cpp
===================================================================
--- Core/Code/Rendering/mitkVtkPropRenderer.cpp	(revision 21081)
+++ Core/Code/Rendering/mitkVtkPropRenderer.cpp	(working copy)
@@ -652,6 +652,11 @@
 
 vtkAssemblyPath* mitk::VtkPropRenderer::GetNextPath()
 {
+  if (m_DataStorage.IsNull())
+  {
+	  return NULL;
+  }
+
   if ( m_PickingObjectsIterator == m_PickingObjects->end() )
   {
     return NULL;