Getting data from firebase are emtpy in html

I’m tryg to get data from my database firebase, but I get no data to show in list item html because I pushed UserId first in database.

items: Observable<any[]>;
itemsRef: AngularFireList<any>;

  constructor(,public fire: AngularFireAuth,public db: AngularFireDatabase) 
        this.itemsRef = db.list('report/');
        // Use snapshotChanges().map() to store the key
        this.items = this.itemsRef.snapshotChanges().pipe(
          map(changes => 
   => ({ key: c.payload.key, ...c.payload.val() }))


you can see here no data to show in list item


  <ion-list *ngFor="let item of items | async"> 

      <ion-item-options side="right"> 
        <button ion-button color="danger" (click)="deletReport(item.key)">
          <ion-icon  ios="ios-trash" md="md-trash" item-end large></ion-icon>
        <button ion-button color="primary" (click)="updatereport(item.key,,item.title)">
          <ion-icon ios="ios-create" md="md-create"></ion-icon>