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 HTMLResult.EMPTY;
    }
    if (
      this.breakBefore.children.length > 1 ||
      this.breakAfter.children.length > 1
    ) {
      
      
      warn(
        "XFA - Several breakBefore or breakAfter in subforms: please file a bug."
      );
    }
    
    fixDimensions(this);
    const children = [];
    const attributes = {
      id: this[$uid],
    };
    if (!this[$extra]) {
      this[$extra] = Object.create(null);
    }
    Object.assign(this[$extra], {
      children,
      attributes,
      attempt: 0,
      availableSpace,
      width: 0,
      height: 0,
      prevHeight: 0,
      currentWidth: 0,