
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)


fontCharCode = mapSpecialUnicodeValues(fontCharCode);
      }
      if (this.isType3Font) {
        
        operatorListId = fontCharCode;
      }
      var accent = null;
      if (this.seacMap && this.seacMap[charcode]) {
        isInFont = true;
        var seac = this.seacMap[charcode];
        fontCharCode = seac.baseFontCharCode;
        accent = {
          fontChar: String.fromCodePoint(seac.accentFontCharCode),
          offset: seac.accentOffset,
        };
      }
      let fontChar = "";
      if (typeof fontCharCode === "number") {
        if (fontCharCode <= 0x10ffff) {
          fontChar = String.fromCodePoint(fontCharCode);
        } else {
          warn(`charToGlyph - invalid fontCharCode: ${fontCharCode}`);
        }
      }
      var glyph = this.glyphCache[charcode];
      if (
        !glyph ||
        !glyph.matchesForCache(
          fontChar,
          unicode,