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.
return new Bookend(attrs);
  }
  static boolean(attrs) {
    return new BooleanElement(attrs);
  }
  static border(attrs) {
    return new Border(attrs);
  }
  static break(attrs) {
    return new Break(attrs);
  }
  static breakAfter(attrs) {
    return new BreakAfter(attrs);
  }
  static breakBefore(attrs) {
    return new BreakBefore(attrs);
  }
  static button(attrs) {
    return new Button(attrs);
  }
  static calculate(attrs) {
    return new Calculate(attrs);
  }
  static caption(attrs) {
    return new Caption(attrs);
  }
  static certificate(attrs) {
    return new Certificate(attrs);
  }
  static certificates(attrs) {