react state sets to null after redirecting from another page using history() and later updates to the correct value - Firebase

Question

I get this error when the profile page(redirects from login) finishes loading 'Unhandled Rejection (TypeError): Cannot read property 'email' of null'. Can someone explain how I could wait for the state to set before executing another code

Answer 1

Use the onAuthState listener like here:

firebase.auth().onAuthStateChanged(function(user) {
  if (user) {
    // User is signed in.
  }
});

You can find more about it here .