Attach (recommended) or Link to PDF file here:
PDF from #4106, https://mail.gnome.org/archives/evince-list/2013-November/pdfNC0hkVW67a.pdf.

Steps to reproduce the problem:
1. Open the PDF

What is the expected behavior?
![immagine](https://user-images.githubusercontent.com/1616846/121865567-67ca4200-ccfe-11eb-8673-1d6e863fc8d5.png)

What went wrong?
The PDF doesn't load, `TypeError: can't access property Symbol(), match is null` error is logged in the console.
if (this.overline !== 0) {
      style.textDecoration = "overline";
      if (this.overline === 2) {
        style.textDecorationStyle = "double";
      }
    }
    
    if (this.posture !== "normal") {
      style.fontStyle = this.posture;
    }
    const fontSize = measureToString(0.99 * this.size);
    if (fontSize !== "10px") {
      style.fontSize = fontSize;
    }
    style.fontFamily = getFonts(this.typeface);
    if (this.underline !== 0) {
      style.textDecoration = "underline";
      if (this.underline === 2) {
        style.textDecorationStyle = "double";
      }
    }
    
    if (this.weight !== "normal") {
      style.fontWeight = this.weight;
    }
    return style;
  }
}
class Format extends XFAObject {