System.NullReferenceException when trying to view a PST file as PDF

I have tried this package and it seems to have fixed the issue, Thank you.

@rhuebnerNNI

You’re welcome. You can use this package for now. It is identical to the NuGet Gallery | GroupDocs.Viewer 23.3.0 + fix for this issue. The fix will be a part of the next public release.

Okay, Please let me know when the next public release is available.

@rhuebnerNNI

Sure, at the moment I don’t have exact date but we’ll notify you when the new release will be available.

@rhuebnerNNI

The latest version of GroupDocs.Viewer 23.6 includes the fix for this issue. The version is available at

Have a nice day!