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.
this.radius = getMeasurement(attributes.radius);
    this.stroke = getStringOption(attributes.stroke, [
      "solid",
      "dashDot",
      "dashDotDot",
      "dashed",
      "dotted",
      "embossed",
      "etched",
      "lowered",
      "raised",
    ]);
    this.thickness = getMeasurement(attributes.thickness, "0.5pt");
    this.use = attributes.use || "";
    this.usehref = attributes.usehref || "";
    this.color = null;
    this.extras = null;
  }
  [$toStyle]() {
    
    
    
    
    
    const style = toStyle(this, "visibility");
    style.radius = measureToString(this.join === "square" ? 0 : this.radius);
    return style;
  }
}
class DateElement extends ContentObject {