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.
leader = null;
      }
      if (trailer) {
        page.children.push(trailer[$toHTML](page[$extra].space).html);
        trailer = null;
      }
      const contentAreas = pageArea.contentArea.children;
      const htmlContentAreas = page.children.filter(node =>
        node.attributes.class.includes("xfaContentarea")
      );
      for (let i = 0, ii = contentAreas.length; i < ii; i++) {
        const contentArea = (this[$extra].currentContentArea = contentAreas[i]);
        const space = { width: contentArea.w, height: contentArea.h };
        if (leader) {
          htmlContentAreas[i].children.push(leader[$toHTML](space).html);
          leader = null;
        }
        if (trailer) {
          htmlContentAreas[i].children.push(trailer[$toHTML](space).html);
          trailer = null;
        }
        let html = root[$toHTML](space);
        if (html.success) {
          if (html.html) {
            htmlContentAreas[i].children.push(html.html);
          }
          return mainHtml;
        }
        
        let mustBreak = false;