
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)


var accentOffset = {
            x: seac[0] * matrix[0] + seac[1] * matrix[2] + matrix[4],
            y: seac[0] * matrix[1] + seac[1] * matrix[3] + matrix[5],
          };
          var charCodes = getCharCodes(mapping, glyphId);
          if (!charCodes) {
            
            
            continue;
          }
          for (let i = 0, ii = charCodes.length; i < ii; i++) {
            var charCode = charCodes[i];
            
            
            var charCodeToGlyphId = newMapping.charCodeToGlyphId;
            var baseFontCharCode = createCharCode(
              charCodeToGlyphId,
              baseGlyphId
            );
            var accentFontCharCode = createCharCode(
              charCodeToGlyphId,
              accentGlyphId
            );
            seacMap[charCode] = {
              baseFontCharCode,
              accentFontCharCode,
              accentOffset,
            };
          }
        }