I would appreciate a workaround on this.  I am not sure what you mean by broken structure.  I think you mean the graph has no good data in it.  The reason is that the graph is an Excel object and we are using Apose.Cells' Smart Designer Workbook feature to insert data into the embedded Excel worksheet.  So the worksheet has only smart tags in it and good data would be replace tags later on in the application.

I would think many users of Aspose would like to do this to update a graph in a presentation..

I mean internal ppt structure of 6th slide.
I have published 2.8.9 hot fix. Please try it.
It doesn't throw exception anymore.

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Alexey Zhilin
Team Leader
Aspose Tyumen Team
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I no longer have the problem.  Thanks very much!