NodeJS Async: Callback already called?

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I'm using Async module in Node.JS to keep track of my asynchronous calls. However, I'm getting an error - "Callback already called." Can someone help me out here?

async.each(data['results'], function(result, done) { 
    if (result['twitter_id'] !== null) { //Isolate twitter handle
        var param = { "user.screen_name": result['twitter_id']}
        db.test4.find( param, function(err, users) {
            if( err ) {
                return done(err);
            } else if (!users) {
                res.send("No user found");
            } else {
                users.forEach( function(Result) { 
                    twitter_ids.push(Result);
                    //console.log(Result);
                    done();
                });
            }
        });
    }
}, function(err) {  
    if (err) {
        throw err
    }
    res.send(twitter_ids);
});

asked 24 secs ago

user3700442

6