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.
constructor(attributes) {
    super(TEMPLATE_NS_ID, "font",  true);
    this.baselineShift = getMeasurement(attributes.baselineShift);
    this.fontHorizontalScale = getFloat({
      data: attributes.fontHorizontalScale,
      defaultValue: 100,
      validate: x => x >= 0,
    });
    this.fontVerticalScale = getFloat({
      data: attributes.fontVerticalScale,
      defaultValue: 100,
      validate: x => x >= 0,
    });
    this.id = attributes.id || "";
    this.kerningMode = getStringOption(attributes.kerningMode, [
      "none",
      "pair",
    ]);
    this.letterSpacing = getMeasurement(attributes.letterSpacing, "0");
    this.lineThrough = getInteger({
      data: attributes.lineThrough,
      defaultValue: 0,
      validate: x => x === 1 || x === 2,
    });
    this.lineThroughPeriod = getStringOption(attributes.lineThroughPeriod, [
      "all",
      "word",