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, "para",  true);
    this.hAlign = getStringOption(attributes.hAlign, [
      "left",
      "center",
      "justify",
      "justifyAll",
      "radix",
      "right",
    ]);
    this.id = attributes.id || "";
    this.lineHeight = attributes.lineHeight
      ? getMeasurement(attributes.lineHeight, "0pt")
      : "";
    this.marginLeft = attributes.marginLeft
      ? getMeasurement(attributes.marginLeft, "0pt")
      : "";
    this.marginRight = attributes.marginRight
      ? getMeasurement(attributes.marginRight, "0pt")
      : "";
    this.orphans = getInteger({
      data: attributes.orphans,
      defaultValue: 0,
      validate: x => x >= 0,
    });
    this.preserve = attributes.preserve || "";
    this.radixOffset = attributes.radixOffset
      ? getMeasurement(attributes.radixOffset, "0pt")
      : "";
    this.spaceAbove = attributes.spaceAbove