Node.js socket.io disconnect event won't trigger

I'm developing an app using socket io but my diconnect trigger event isn't working, I did everything like the docs say and it's still the same... It was working a few days ago but now it's not working anymore, I didn't edit any code since then

var io = require('socket.io')(server); io.on('event', function(data){}); var socketUsers = []; io.use(sharedSession(session, { autoSave: true })); io.on('connection', function(socket) { socketUsers.push(socket); console.log('Player connected: ' + socket.id); console.log('Connected players: ' + socketUsers.length); io.on('disconnect', function() { for(var i = 0; i < socketUsers.length; i++) { console.log(socketUsers[i].id); if(socketUsers[i].id == socket.id) { //delete socketUsers[i]; socketUsers.splice(i); break; } } console.log(socketUsers.length + ' players online.'); }); io.on('chat message', function(msg){ io.emit('chat message', msg); console.log('message: ' + msg); }); function broadcast(key, value) { io.emit(key, value); } });