itext7 C# pdf created twice

Question

I'm am trying to create a PDF with IText7 for C# and everything works fine, there is only this bug where sometimes 2 PDF's are created instead of one. It doesn't happen every time so my guess is it isn't a problem with my code but rather with IText7. I didn't really find anything about this issue online. Anybody know why this happens?

Just to be sure, a snippet of my code:

private const String Dest = "c://pdfs/";
    public static void CreateFirstPaymentReminderPdf(FirstPaymentReminder values)
    {
        String location = Dest + "FirstPaymentReminder_"+ DateTime.Now.ToString("dMyyhhmmss")+".pdf";
        FileInfo file = new FileInfo(location);
        if (file.Directory != null && !file.Directory.Exists) file.Directory.Create();
        //Initialize PDF writer
        PdfWriter writer = new PdfWriter(location);
        //Initialize PDF document
        PdfDocument pdf = new PdfDocument(writer);
        // Initialize document
        Document document = new Document(pdf);
        document.SetMargins(100f,75f,100f,75f);
        //create text
        //-- leaving this out for privacy reasons --
        //Close document
        document.Close();
    }