First Call from .Net core 2 Web API works, next one hangs

I’m using this on Windows 10 with a .Net core 2 web api.

The first call works fine, but subsequent calls hang. Any ideas?

private byte[] GeneratePDFFromHtml(string html)
        {
            var converter = new SynchronizedConverter(new PdfTools());

            var doc = new HtmlToPdfDocument()
            {
                GlobalSettings =
                {
                    ColorMode = ColorMode.Color,
                    Orientation = Orientation.Landscape,
                    PaperSize = PaperKind.A4Plus
                },
                Objects =
                {
                    new ObjectSettings()
                    {
                        PagesCount = true,
                        HtmlContent = html,
                        WebSettings =
                        {
                            DefaultEncoding = "utf-8"
                        },
                        HeaderSettings =
                        {
                            FontSize = 9,
                            Right = "Page [page] of [toPage]",
                            Line = true,
                            Spacing = 2.812
                        }
                    }
                }
            };

            var bytes = converter.Convert(doc);

            return bytes;
        }

[pritampashtev2]

this solution didn’t worked for me. I have declared singleton but still it stops at line var bytes = converter.Convert(doc); Please suggest.

[rdvojmoc]

You must declare SynchronizedConverter as singleton. Example with DI.