Ionic 3 firebase auto complete search

Ionic Framework ionic-v3
1

I need to implement an ionic search which filters firebase data.

Here i getting data

 dgetPlaces()
  {
    let ref = this.afDB.list('places').snapshotChanges()
    .map(changes =>{
      return changes.map(c=> ({key:c.payload.key,...c.payload.val()}));
    });

    return ref;
  }

Then i Called on my home like

initializeItems()
  {
      this.places = this.dataProvider.dgetPlaces();
  }

here is the html part for searching

<div class="contents">
    <ion-searchbar [(ngModel)]="searchQuery" (ionInput)="setFilteredItems($event)"></ion-searchbar>
</div>

and finally here is the search function

setFilteredItems()
{
  this.initializeItems();
  
  this.places = this.places.filter((place)=>{
    console.log(place.name)
    return place.name.toLowerCase().indexOf(this.searchQuery.toLowerCase())>-1;
  })
}

This works perfectly when i have normal array for places.But after adding firebase data the search is not working.It says

ERROR TypeError: Cannot read property 'toLowerCase' of undefined

How could I slove this???