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System.NullReferenceException calling Aspose.Slides.Presentation.set_SlideSize(Size value)

Since moving to the latest hot fix I am randomly experiencing the following error

System.NullReferenceException: Object reference not set to an instance of an object.
at Aspose.Slides.Presentation.set_SlideSize(Size value)

I am unable to replicate this at will, but I can say that the parameters were ok and it seemed to be a bug in the API.

Can you please show your code and also the presentation which caused this?