Passport Js发送错误Bad请求作为响应

Question

app.post("/register", isLogged ,function(req, res){
var newUser = new User(
    {
        username: req.body.username,
        firstname: req.body.firstname,
        lastname: req.body.lastname,
        avatar: req.body.avatar,
        email: req.body.email

});
User.register(newUser, req.body.password, function(err, user){
    if(err){
        return res.redirect("/register");
        console.log(err);
    }
    passport.authenticate("local")(req, res, function(){
        req.flash("success","Welcome to the pharmacist's diary " +  user.username+ "!" );
        res.redirect("/records");
    });
});

为什么这条路线无法正常工作，并继续发送相同的信息＆＃39;错误请求＆＃39;。

function isLogged(req, res, next){
if(req.isAuthenticated()){
    req.flash("error", "You are already logged in!");
    res.redirect("/records");
}else {
     return next();
}

} 这是isLogged代码（使用中间件）