AngularFire2 unsubscribe on logout, database permission errors on unclosed subscription

I have this code here using AngularFire2 version that I use to grab some member from the database on one of my components.

I have an issue when I call this logout in the same component. I unsubscribe from the Subscriptions but I still get the error in the console saying Exception was thrown by user callback. Error: permission_denied at /users/uid. I know it's because I am no longer signed in and my database rules don't allow this read operation. I don't know why it's still trying to read data if I already unsubscribed.

    constructor(private afAuth: AngularFireAuth, private db: AngularFireDatabase) {
        this.user = afAuth.authState;

        this.userSub = this.user.subscribe(auth => {
            if (auth) {
                this.member = db.object('/users/' + auth.uid);
                this.dbSub = this.member.subscribe();
            }
        });
    }

    logout() {
        this.dbSub.unsubscribe();
        this.userSub.unsubscribe();

        this.afAuth.auth.signOut()
            .then(() => this.router.navigateByUrl('/login'));
    }