I am trying to build a function that allows user to change their password. The problem is when I am getting the current user's data it shows that the email is null.

Everything works on Firebase, users are creating in Firebase auth system.

Here is a part of my code

reauthenticate = (currentPassword) => {
    var user = firebase.auth().currentuser;
    var cred = firebase.auth.EmailAuthProvider.credential(user.email, currentPassword);
    user.reauthenticateWithCredential(cred);
}

reauthenticate(currentPassword).then(() => {
    var user = firebase.auth().currentuser;
    user.updatePassword(newPassword).then(() => {
        alert("Password changed");
        window.location.replace("./index.html");
    }).catch((error) => {
        console.log(error);
    })
});

What console shows is Uncaught TypeError: Cannot read properties of undefined (reading 'email') at reauthenticate (password.js:15:64) at changePassword (password.js:27:9)