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An error within the pathToHashKeys proceadure

See original GitHub issue

When I run chevrotain, it gives me this error:

/Users/pmk/codes/lumberjack/node_modules/chevrotain/lib/src/parse/grammar/lookahead.js:355
            for (var t = 0; t < tokType.categoryMatches.length; t++) {
                                                        ^

TypeError: Cannot read property 'length' of undefined
    at pathToHashKeys (/Users/pmk/codes/lumberjack/node_modules/chevrotain/lib/src/parse/grammar/lookahead.js:355:57)
    at /Users/pmk/codes/lumberjack/node_modules/chevrotain/lib/src/parse/grammar/lookahead.js:431:42
    at Object.forEach (/Users/pmk/codes/lumberjack/node_modules/chevrotain/lib/src/utils/utils.js:77:30)
    at _loop_1 (/Users/pmk/codes/lumberjack/node_modules/chevrotain/lib/src/parse/grammar/lookahead.js:430:29)
    at lookAheadSequenceFromAlternatives (/Users/pmk/codes/lumberjack/node_modules/chevrotain/lib/src/parse/grammar/lookahead.js:441:13)
    at Object.getLookaheadPathsForOr (/Users/pmk/codes/lumberjack/node_modules/chevrotain/lib/src/parse/grammar/lookahead.js:450:12)
    at /Users/pmk/codes/lumberjack/node_modules/chevrotain/lib/src/parse/grammar/checks.js:377:40
    at Object.reduce (/Users/pmk/codes/lumberjack/node_modules/chevrotain/lib/src/utils/utils.js:208:32)
    at validateAmbiguousAlternationAlternatives (/Users/pmk/codes/lumberjack/node_modules/chevrotain/lib/src/parse/grammar/checks.js:374:24)
    at /Users/pmk/codes/lumberjack/node_modules/chevrotain/lib/src/parse/grammar/checks.js:42:20

The codes are proprietary, so if you want to contact me to give you access to the the codes.