Nodejs Github api gist create - receiving Socket Hang up

I'm trying to create Gist through github api - using npm module "github" (https://github.com/ajaxorg/node-github/)

I have this code

  var gh = new GitHubApi({
    version: "3.0.0"
  });

  gh.authenticate({
    type: "oauth",
    token: data.token
  });

  gh.user.get({}, function (err, data) {
    console.log(err);
    console.log(data);

    var blob = {};
    blob.repo = commitData.repo;
    blob.user = commitData.user;
    blob.content = commitData.content;
    blob.encoding = commitData.encoding;
        gh.gitdata.createBlob(blob, function (err, blob) {
           console.log(err);
           console.log(blob);
           cb('failed');
       });
  });

The problem is that createBlob function is receiving this

{ 
  defaultMessage: 'Internal Server Error',
  message: 'socket hang up',
  code: '500' 
}

I'm running my app on heroku free instance (its based on express).

Thanks a lot, I am solving it for days and still cant make it working.