Display data from the Firebase Database

Good evening, thank you. I can recover from the console but I can not see the content on the address page. I have this error


adresse = {} as Adresse;

  constructor(private router: Router) {}

    let useradresse = firebase.database().ref('adresse/'+ firebase.auth().currentUser.uid);
    useradresse.once('value').then((snapshot) => {
      snapshot.forEach((addressSnapshot) => {
        console.log (addressSnapshot.val()); // shows the address value 
        this.adresse = addressSnapshot.val();


Page html

    <ion-card *ngFor="let adress of adresse; let i = index" (click)="onViewAdresse(i)">
                <ion-col size="9" >
                        <!--<ion-col size="9" (click)="goTo(adress)">-->
                    <div><b>{{adress.prenom}} {{adress.nom}} </b></div>

                <ion-col size="3">
                    <div class="color-edit"><b>Modifier</b></div>