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.
const left = measureToString(this.x);
    const top = measureToString(this.y);
    const style = {
      position: "absolute",
      left,
      top,
      width: measureToString(this.w),
      height: measureToString(this.h),
    };
    return HTMLResult.success({
      name: "div",
      children: [],
      attributes: {
        style,
        class: ["xfaContentarea"],
        id: this[$uid],
      },
    });
  }
}
class Corner extends XFAObject {