Trouble reading images inside a PDF file

[pstragliotto]

Hello,

in a c# project we developed we used your library to extract images inside PDF layers.
This has always worked like a charm in Windows.
Lately we had to port the application to macOS as well, and generally the library works well for exporting PDF etc.
But for the specific need to extract images from an existing PDF file, the app crashes when trying to
read from the PDFPage object with

var resources = page.Elements.GetDictionary("/Resources");
var xObjects = resources.Elements.GetDictionary("/XObject");

We are currently using PDFSharp version 6.2.0.
Any suggestion?