passportjs error callback throwing exception

Question

I'm using LocalStrategy with MYSQL(with sequelize) which is working except when MYSQL throws exception (just to test, I shut down MYSQL server). The return done(error) callback throwing exception crashing server.

Here is my piece of code:

passport.use(new LocalStrategy({usernameField: 'email', passwordField: 'password'},
    function (email, password, done) {
        db.User.find({where: {email: email}}).done(function (error, user) {
            if(error) return done(error);

            if (!user) return done(null, false, {message: 'unknown user'});

            //validate password
            if (user.password != password) {
                return done(null, false, {message: 'invalid password'});
            }
            //all ok
            return done(null, user);
        });
    }
));

And the exception:

TypeError: Property 'next' of object #<Context> is not a function
    at Context.actions.error

What am I doing wrong? Thanks!

EDIT:

    req._passport.instance.authenticate('local', function (err, user, info) {
        if (err) return validator.emit('exception', err);

        if (!user) {
            validator.result.errors.push('Username and password combination not found.');
            validator.emit('response');
        } else {
            req.login(user, function (error) {
                if (error) return validator.emit('exception', error);

                validator.emit('response');
            });
        }
    })(req, res);

Answer 1

OK silly me, I missed the next at the end

req._passport.instance.authenticate('local', function (err, user, info) {
.....
})(req, res, next);