
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)


}
        throw new FormatError(
          `TrueType Collection does not contain "${fontName}" font.`
        );
      }
      /**
       * Read the appropriate subtable from the cmap according to 9.6.6.4 from
       * PDF spec
       */
      function readCmapTable(cmap, file, isSymbolicFont, hasEncoding) {
        if (!cmap) {
          warn("No cmap table available.");
          return {
            platformId: -1,
            encodingId: -1,
            mappings: [],
            hasShortCmap: false,
          };
        }
        var segment;
        var start = (file.start ? file.start : 0) + cmap.offset;
        file.pos = start;
        file.skip(2); 
        var numTables = file.getUint16();
        var potentialTable;
        var canBreak = false;