diff --git a/src/SMESHGUI/SMESHGUI_AddMeshElementDlg.cxx b/src/SMESHGUI/SMESHGUI_AddMeshElementDlg.cxx
index e4654aa62..165b1487c 100644
--- a/src/SMESHGUI/SMESHGUI_AddMeshElementDlg.cxx
+++ b/src/SMESHGUI/SMESHGUI_AddMeshElementDlg.cxx
@@ -217,6 +217,7 @@ namespace SMESH
     void SetBallPosition(SMESH_Actor* theActor,TVTKIds& theIds, double theDiameter)
     {
       vtkUnstructuredGrid *aGrid = theActor->GetUnstructuredGrid();
+      myBallPolyData->SetPoints(NULL);
       myBallPolyData->Reset();
       myBallPolyData->DeleteCells();
       myBallPolyData->SetPoints(aGrid->GetPoints());