CODEWITHSUNDEEP
firebaseionic4
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Reputation: 21

Cannot read property 'uid' of null when logout

Every time I logout from my app, I get

Cannot read property 'uid' of null

from console. it leads reference to below code:

constructor( private firestore: AngularFirestore, private auth: AuthService, ) 
{
firebase.auth().onAuthStateChanged(user => {
  if (this.currentUser == user) {
    this.currentUser = firebase.auth().currentUser;
    this.vendor = firebase.firestore().doc(`/Products/${this.currentUser.uid}`);
  }
});

Upvotes: 0

Views: 404

Answers (2)

Nur Mohammad Rayhan
Nur Mohammad Rayhan

Reputation: 31

you can use uid for optional chaining

firebase.firestore().doc(`/Products/${this.currentUser?.uid}`)

or another solution is when you logout from the system set current user is null or empty object

setCurrentUser({})

Upvotes: 0

Frank van Puffelen
Frank van Puffelen

Reputation: 598837

The onAuthStateChanged callback will fire whenever the user's authentication state changes, so whenever they sign in, or they're signed out. In the latter case, the user will be null, which you don't handle correctly in your code right now.

This looks more correct:

firebase.auth().onAuthStateChanged(user => {
  this.currentUser = firebase.auth().currentUser;
  if (this.currentUser) {
    this.vendor = firebase.firestore().doc(`/Products/${this.currentUser.uid}`);
  }
});

Upvotes: 1

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