
Attach (recommended) or Link to PDF file here:
[NAPEN16171380959.pdf](https://github.com/mozilla/pdf.js/files/6143802/NAPEN16171380959.pdf)

Configuration:
- Web browser and its version: Firefox 88 Nightly
- Operating system and its version: Windows 10
- PDF.js version:
- Is a browser extension: No

What went wrong? (add screenshot)
![](https://user-media-prod-cdn.itsre-sumo.mozilla.net/uploads/images/2021-03-15-10-58-27-ce2796.png)


cff.duplicateFirstGlyph();
          var compiler = new CFFCompiler(cff);
          tables["CFF "].data = compiler.compile();
        } catch (e) {
          warn("Failed to compile font " + properties.loadedName);
        }
      }
      
      if (!tables.name) {
        tables.name = {
          tag: "name",
          data: createNameTable(this.name),
        };
      } else {
        
        var namePrototype = readNameTable(tables.name);
        tables.name.data = createNameTable(name, namePrototype);
      }
      var builder = new OpenTypeFileBuilder(header.version);
      for (var tableTag in tables) {
        builder.addTable(tableTag, tables[tableTag].data);
      }
      return builder.toArray();
    },
    convert: function Font_convert(fontName, font, properties) {
      
      properties.fixedPitch = false;
      if (properties.builtInEncoding) {