node-mongo-native findAndModify callback

I have been trying to get code in callback executed for couple of days now but am I not sure what I am doing wrong. Following is the code which I am trying to execute. For some reason callback is not getting executed even though the sequence is getting incremented.

Please help.

var seqCollection = new mongodb.Collection(client, 'seq');
seqCollection.findAndModify(
    {"_id": "name"}, [], {$inc: {"seq": 1}}, {},
    function (err, result) {
        if (err){
            console.log('--------- There is a an error ------------');
        } else{
            console.log('--------- New Value:' + JSON.stringify(result) + '------------');
        }
});