This is how I'm using the method:
github.repos.getStatsContributors({
         repo: 'Cloudformation-Webserver',
         owner : 'DorrinPk'
    }, function (err, res) { 
        console.log(err, res);
    });
The first time I run it for the repo I get null results. The second time I run it I get :
null { data: [ { total: 4, weeks: [Object], author: [Object] } ],   meta:    { 'x-ratelimit-limit': '5000',
     'x-ratelimit-remaining': '4968',
     'x-ratelimit-reset': '1499712495',
     'x-oauth-scopes': 'admin:org, admin:repo_hook, notifications, repo, user',
     'x-github-request-id': 'A05B:0684:271B6:59CB1:5963C4D0',
     'x-github-media-type': 'github.v3; format=json',
     etag: '"f1ea81d88281adf31e1178d0804f230c"',
     status: '200 OK' } }
I know total:4 is the number of my commits on the repo but I only get [Object] back for author and weeks. 
am I doing something wrong? I was expecting to get similar results to this.
 
    