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Artifacts is NULL after Splitting PDF Files and Adding Watermark using C#

I split a Pdf in more documents then I add a watermark on every one.
If the file is signed, in the pages where I want to add the watermark the Artifacts property is null and I get the error: Object reference not set to an instance of an object
Obviously, Artifacts is null

But if I do the same operation with a not signed Pdf every thing works fine.

Any suggestion on how to split a signed pdf in more document and add Watermark on every one?


To ensure a timely and accurate response, please attach the following resources here for testing:

  • Your input PDF document.
  • Please create a standalone console application (source code without compilation errors) that helps us to reproduce your problem on our end and attach it here for testing.

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