Node.js + mongoose [RangeError: Maximum call stack size exceeded]

I am new to Node and I'm facing an error :

[RangeError: Maximum call stack size exceeded]

I'm not able able to solve the problem because most of the stack problems in others stackoverflow questions about node deals with hundreds of callback but I have only 3 here.

First a fetch (findbyid) then an update an later a save operation!

My code is :

app.post('/poker/tables/:id/join', function(req,res){
var id = req.params.id;

models.Table.findById(id, function (err, table) {
    if(err) { console.log(err); res.send( { message: 'error' }); return; }

    if(table.players.length >= table.maxPlayers ) {
        res.send( { message: "error: Can't join ! the Table is full" });
        return; 
    }
    console.log('Table isnt Full');

    var BuyIn = table.minBuyIn;
    if(req.user.money < table.maxPlayers ) {
        res.send( { message: "error: Can't join ! Tou have not enough money" });
        return; 
    }
    console.log('User has enought money');

    models.User.update({_id:req.user._id},{ $inc:{ money : -BuyIn }}, function(err, numAffected) {
        if(err) { console.log(err); res.send( { message: 'error: Cant update your account' }); return; }
        console.log('User money updated');


        table.players.push( {userId: req.user._id, username: req.user.username, chips:BuyIn, cards:{}} );


        table.save(function (err) {
            if(err) { console.log(err); res.send( { message: 'error' });return; }           

            console.log('Table Successfully saved with new player!');
            res.send( { message: 'success', table: table});

        });
    });

})});

The error occurs during the save operation at the end!

I use MongoDb with mongoose so 'Table' and 'User' are my database collections.

This is from my first project with nodejs,expressjs and mongodb so I probably have made huge mistakes in the async code :(

EDIT: I tried to replace the save with an update:

models.Table.update({_id: table._id}, { '$push': { players : {userId: req.user._id, username: req.user.username, chips:BuyIn, cards:{}} } }, function(err,numAffected) {

                if(err) { console.log(err); res.send( { message: 'error' });return; }           

                console.log('Table Successfully saved with new player!');
                res.send( { message: 'success', table: table});


            });

But it doesn't help the error is still coming and I don't know how to debug it :/