diff --git a/src/SMESHGUI/SMESHGUI_MeshPatternDlg.cxx b/src/SMESHGUI/SMESHGUI_MeshPatternDlg.cxx
index 047781d20..e896c4e6c 100755
--- a/src/SMESHGUI/SMESHGUI_MeshPatternDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_MeshPatternDlg.cxx
@@ -516,6 +516,8 @@ void SMESHGUI_MeshPatternDlg::onSelectionDone()
     } else if (mySelInput == Ids) {
       SALOME_ListIO aList;
       mySelectionMgr->selectedObjects(aList,SVTK_Viewer::Type());
+      if (aList.Extent() != 1)
+	return;
 
       QString anIds;
       if (!SMESH::GetNameOfSelectedElements(mySelector, aList.First(), anIds))