diff --git a/src/SMESHGUI/SMESHGUI_Filter.cxx b/src/SMESHGUI/SMESHGUI_Filter.cxx
index 08da7c923..52f36378b 100755
--- a/src/SMESHGUI/SMESHGUI_Filter.cxx
+++ b/src/SMESHGUI/SMESHGUI_Filter.cxx
@@ -83,8 +83,8 @@ bool SMESHGUI_PredicateFilter::IsValid( const int theCellId ) const
   if ( myActor == 0 || myPred->_is_nil() )
     return false;
 
-  SMESH_Actor* anActor = ( SMESH_Actor* )myActor;
-  if ( anActor->GetObject() == 0 )
+  SMESH_Actor* anActor = dynamic_cast<SMESH_Actor*>( myActor );
+  if ( !anActor || anActor->GetObject() == 0 )
     return false;
   
   SMDS_Mesh* aMesh = anActor->GetObject()->GetMesh();