Node.js Socket.io sets up multiple connections

Im creating a simple socket.io chat that uses passport.js for authentication. But everytime a user logout and login the old socket connection reconnects. This causes a problem because now there are two active connections to one page. So what I want to do is end the current connection when the user navigates to "/logout".

var socketNotLoaded = true;
var socket;

app.get('/', function(req, res) {
    if (req.isAuthenticated()) {
        if(socketNotLoaded) { //is true when new connection is required
            require("./socket")(io,req.user) //runs the socket.io script
            socketNotLoaded = false;
        }
        res.render('index', pug.get(req.user));
    } else {
        res.render('notloggedin', pug.get());
    }
})

app.get('/logout', function(req, res) {
    socketNotLoaded = true;
    req.logout();
    res.redirect('/');
})

Im using

• socket.io: 2.0.3
• passport: 0.4.0
• passport-local: 1.0.0
• express: 4.15.4
• express-session: 1.15.5
• cookie-parser: 1.4.3
• body-parser: 1.17.2