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Same thing happens in F35.

I can confirm the issue still occurs on F35 with pdfmod-0.9.1-26.fc35.x86_64



$ pdfmod  Web.pdf 
[1 Debug 17:10:35.299] Starting PdfMod 0.9.1
[1 Debug 17:10:35.307] Initializing i18n catalog from /usr/share/locale/
Gtk-Message: 17:10:35.322: Failed to load module "pk-gtk-module"
[1 Debug 17:10:35.327] Loaded custom AccelMap from /home/sellis/.config/pdfmod/gtk_accel_map
[1 Debug 17:10:35.338] Cache directory set to /home/sellis/.cache/pdfmod
[1 Debug 17:10:35.497] Loaded Web.pdf
[sellis@t480s Downloads]$ pdfmod  Weber-Q-Cleaner-SDS.pdf 
[1 Debug 17:10:42.882] Starting PdfMod 0.9.1
[1 Debug 17:10:42.890] Initializing i18n catalog from /usr/share/locale/
Gtk-Message: 17:10:42.902: Failed to load module "pk-gtk-module"
[1 Debug 17:10:42.907] Loaded custom AccelMap from /home/sellis/.config/pdfmod/gtk_accel_map
[1 Debug 17:10:42.915] Cache directory set to /home/sellis/.cache/pdfmod
[1 Debug 17:10:43.073] Loaded Weber-Q-Cleaner-SDS.pdf
Exception in Gtk# callback delegate
  Note: Applications can use GLib.ExceptionManager.UnhandledException to handle the exception.
System.NullReferenceException: Object reference not set to an instance of an object
  at Gtk.Entry.TextInsertedSignalCallback (System.IntPtr arg0, System.IntPtr arg1, System.Int32 arg2, System.Int32& arg3, System.IntPtr gch) [0x00082] in <7aab76e87bce48a4b45cf7fa613cb70c>:0 
  at GLib.ExceptionManager.RaiseUnhandledException (System.Exception e, System.Boolean is_terminal) [0x00000] in <ed39f21b9e9343dcbd442a17ad356a9f>:0 
  at Gtk.Entry.TextInsertedSignalCallback (System.IntPtr arg0, System.IntPtr arg1, System.Int32 arg2, System.Int32& arg3, System.IntPtr gch) [0x00000] in <7aab76e87bce48a4b45cf7fa613cb70c>:0 
  at Gtk.Entry.gtk_entry_set_text (System.IntPtr , System.IntPtr ) [0x00000] in <7aab76e87bce48a4b45cf7fa613cb70c>:0 
  at Gtk.Entry.set_Text (System.String value) [0x00000] in <7aab76e87bce48a4b45cf7fa613cb70c>:0 
  at PdfMod.Gui.MetadataEditorBox+TextProperty.SetDefault (System.String default_value) [0x00000] in <a1394a6c813949c2a342a6e7f2176d36>:0 
  at PdfMod.Gui.MetadataEditorBox.HandleDocumentLoaded (System.Object o, System.EventArgs e) [0x00000] in <a1394a6c813949c2a342a6e7f2176d36>:0 
  at PdfMod.Core.Client.OnDocumentLoaded () [0x00000] in <a1394a6c813949c2a342a6e7f2176d36>:0 
  at PdfMod.Gui.Client+<LoadPath>c__AnonStorey0.<>m__1 () [0x00000] in <a1394a6c813949c2a342a6e7f2176d36>:0 
  at Hyena.ThreadAssist+<BlockingProxyToMain>c__AnonStorey1.<>m__0 () [0x00000] in <bea5f8dc246647e19ee46c3c4d128568>:0 
  at PdfMod.Gui.Client+<RunIdle>c__AnonStorey4.<>m__0 () [0x00000] in <a1394a6c813949c2a342a6e7f2176d36>:0 
  at GLib.Idle+IdleProxy.Invoke (System.IntPtr data) [0x00000] in <ed39f21b9e9343dcbd442a17ad356a9f>:0 
  at GLib.SourceProxy.HandlerInternal (System.IntPtr data) [0x00000] in <ed39f21b9e9343dcbd442a17ad356a9f>:0 
  at Gtk.Application.gtk_main () [0x00000] in <7aab76e87bce48a4b45cf7fa613cb70c>:0 
  at Gtk.Application.Run () [0x00000] in <7aab76e87bce48a4b45cf7fa613cb70c>:0 
  at PdfMod.Gui.Client..ctor (System.Boolean loadFiles) [0x00000] in <a1394a6c813949c2a342a6e7f2176d36>:0 
  at PdfMod.PdfMod.Main (System.String[] args) [0x00000] in <a1394a6c813949c2a342a6e7f2176d36>:0

If you want to reproduce the issue it occurs with
 - https://images.thdstatic.com/catalog/pdfImages/72/723384dc-a413-437f-b29a-bb018ed10866.pdf

Arch Linux also has an open issue
 - https://bugs.archlinux.org/task/70143

This message is a reminder that Fedora Linux 35 is nearing its end of life.
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The same issue occurs on F37 with pdfmod-0.9.1-28.fc37.x86_64.

Still happens on F38 with pdfmod-0.9.1-29.fc38.x86_64

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