onLoadFinished function gets called multiple times

[ghost]

horseman
.on("loadFinished", function (status) {
console.log("came here in load finished function : " + status);
})
.on("error", function () {
res.json({message : "invalid url. unable to connect"});
})
.userAgent('Mozilla/5.0 (Windows NT 6.1; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0')
.open(url)
.html()
.then(function (html) {
});

In the above code the on load finished function gets called multiple times