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, "rectangle",  true);
    this.hand = getStringOption(attributes.hand, ["even", "left", "right"]);
    this.id = attributes.id || "";
    this.use = attributes.use || "";
    this.usehref = attributes.usehref || "";
    this.corner = new XFAObjectArray(4);
    this.edge = new XFAObjectArray(4);
    this.fill = null;
  }
  [$toHTML]() {
    const edge = this.edge.children.length
      ? this.edge.children[0]
      : new Edge({});
    const edgeStyle = edge[$toStyle]();
    const style = Object.create(null);
    if (this.fill) {
      Object.assign(style, this.fill[$toStyle]());
    } else {
      style.fill = "transparent";
    }
    style.strokeWidth = measureToString(2 * edge.thickness);
    style.stroke = edgeStyle.color;
    const corner = this.corner.children.length
      ? this.corner.children[0]