I have a report info: "The given key '14' was not present in the dictionary."

[tigerInLuck]

[Error]The given key '14' was not present in the dictionary.
[StackTrace]at System.Collections.Generic.Dictionary`2.get_Item(TKey key)
at PdfSharp.Pdf.Signatures.PdfSignatureHandler.AddSignatureComponents(Object sender, EventArgs e)
at PdfSharp.Pdf.PdfDocument.DoSave(PdfWriter writer)
at PdfSharp.Pdf.PdfDocument.Save(Stream stream, Boolean closeStream)
at PdfSharp.Pdf.PdfDocument.Save(Stream stream)

• Env:
  macOS Version 15.5 (24F74)

• Dev tool:
  JetBrains Rider 2025.1.3

• .NET runtime:
  ver 6.0.403

• PDFsharp-extended:
  ver 1.1.1

please help me to solve the problem , thanks!