TypeError: Cannot read property '!!' of undefined
    at [object Object].parseNode (/home/ixti/projects/js-yaml/lib/js-yaml/parser.js:375:44)
    at [object Object].parseBlockNodeOrIndentlessSequence (/home/ixti/projects/js-yaml/lib/js-yaml/parser.js:324:17)
    at [object Object].parseBlockMappingValue (/home/ixti/projects/js-yaml/lib/js-yaml/parser.js:561:23)
    at [object Object].state (/home/ixti/projects/js-yaml/node_modules/jsclass/src/core.js:56:19)
    at [object Object].checkEvent (/home/ixti/projects/js-yaml/lib/js-yaml/parser.js:110:32)
    at [object Object].composeNode (/home/ixti/projects/js-yaml/lib/js-yaml/composer.js:89:14)
    at [object Object].composeMappingNode (/home/ixti/projects/js-yaml/lib/js-yaml/composer.js:190:24)
    at [object Object].composeNode (/home/ixti/projects/js-yaml/lib/js-yaml/composer.js:115:19)
    at [object Object].composeMappingNode (/home/ixti/projects/js-yaml/lib/js-yaml/composer.js:190:24)
    at [object Object].composeNode (/home/ixti/projects/js-yaml/lib/js-yaml/composer.js:115:19)