The following URL is returning an object that is missing some data:

http://api.onstartups.stackexchange.com/1.1/stats

The entire site object is missing from the returned data. Other sites, such as Math.SE, return the site object:

"site": {
    "name": "Mathematics",
    ...
}

However, this data is being returned for OnStartups in the /sites method:

"main_site": {
    "name": "OnStartups",
    ...
}