[vtkusers] PrintAsCSV method from vtkXYPlotActor crashed

[jhirsch]

Hello guys,
I've taken the plot  example
<http://www.vtk.org/Wiki/VTK/Examples/Cxx/WishList/Images/HistogramXYPlot>  
and wanted to print out the histogram data as CSV file. It crashed because
of a null pointer at this row:
 in the file "vtkXYPlotActor.cxx (VTK 6.3).
My source code looks like this:

I do this right before creating the renderer, so there is some data to
print. Any ideas why it's not working?



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