
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)


map[+charCode] = SupplementalGlyphMapForCalibri[charCode];
          }
        }
        
        
        if (cidToGidMap) {
          for (const charCode in map) {
            const cid = map[charCode];
            if (cidToGidMap[cid] !== undefined) {
              map[+charCode] = cidToGidMap[cid];
            }
          }
        }
        var isIdentityUnicode = this.toUnicode instanceof IdentityToUnicodeMap;
        if (!isIdentityUnicode) {
          this.toUnicode.forEach(function (charCode, unicodeCharCode) {
            map[+charCode] = unicodeCharCode;
          });
        }
        this.toFontChar = map;
        this.toUnicode = new ToUnicodeMap(map);
      } else if (/Symbol/i.test(fontName)) {
        this.toFontChar = buildToFontChar(
          SymbolSetEncoding,
          getGlyphsUnicode(),
          this.differences
        );
      } else if (/Dingbats/i.test(fontName)) {
        if (/Wingdings/i.test(name)) {
          warn("Non-embedded Wingdings font, falling back to ZapfDingbats.");