[vtkusers] problem with CellPicker

[nmitreski]

I have a little problem with my application. Here is part of the code

class vtkMyCallback : public vtkCommand
{
public:
    static vtkMyCallback *New()
    {
        return new vtkMyCallback;
    }
    void Delete()
    {
        delete this;
    }
    virtual void Execute(vtkObject *caller, unsigned long, void*)
    {
        if (cell_picker->GetCellId() == -1)
        {
            contour->Reset();
            lines->Reset();
            modified_actor->VisibilityOff();
            littleactor->VisibilityOff();
        }
        else
        {
            cell_id = cell_picker->GetCellId();
            cout<<"cell id = "<<cell_id<<endl;
            vtkIdType npts, *pts;
            mesh->GetCellPoints(cell_id, npts, pts);
            lines->Allocate(1, 1000);
            lines->InsertNextCell(npts, pts);
            //lines->InsertCellPoint(pts[0]);
            //lines->InsertCellPoint(pts[1]);
            //lines->InsertCellPoint(pts[2]);
            
            contour->SetPolys(lines); //here we are making new polydata
            modified_mapper = vtkPolyDataMapper::New();
            modified_mapper->SetInput(contour);
            modified_actor->SetMapper(modified_mapper);
            modified_actor->VisibilityOn();
            //
            double selPt[3];
            cell_picker->GetSelectionPoint(selPt);

            double pickcoords[3];
            cell_picker->GetPickPosition(pickcoords);
            cout<<"x = "<<pickcoords[0]<<endl;
            cout<<"y = "<<pickcoords[1]<<endl;
            cout<<"z = "<<pickcoords[2]<<endl;
            cout<<endl;

            

            //littlemapper = vtkPolyDataMapper::New();
            littlemapper->SetInput(littleSphere->GetOutput() );

            littleactor->SetMapper(littlemapper);

            littleactor->SetPosition(pickcoords);
            littleactor->VisibilityOn();
        }
        renWin->Render();
    }
};

this is my class which I'm using in
picker->AddObserver(vtkCommand::EndPickEvent, pickObserver);

pickObserver is instance of my class. My problem is: when I'm clicking
several times fast on same point, my application crashes.. I can't find what
is the problem? Any help?

thanks
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