Casey's weird error

[vtsatskin]

@caseyyee has got this error happening

/usr/local/lib/node_modules/mozdoc/node_modules/gift/lib/ref.js:77
        _ref1 = /ref: refs\/heads\/([^\s]+)/.exec(data), m = _ref1[0], branch
                                                                  ^
TypeError: Cannot read property '0' of null
    at /usr/local/lib/node_modules/mozdoc/node_modules/gift/lib/ref.js:77:67
    at fs.js:266:14
    at Object.oncomplete (fs.js:107:15) 

@caseyyee, can I get a steps to reproduce?

[caseyyee]

The issue is definitely related to some of the content in the docs that i was trying to use. Using the included index.md example it all worked fine. Unfortunately the documents in question are in a private repo and are not public accessible at this point.

[caseyyee]

Also, the error is being reported when running "mozdoc serve"