ionInput triggers when closing keyboard

Ionic Framework ionic-v3
1

.html:

 <ion-searchbar
        #input
        [(ngModel)]="searchTerm"
        [formControl]="searchCtrl"
        (ionInput)="onSearchInput()"
        placeholder="Search...">
  </ion-searchbar>

.ts:

  ionViewDidLoad(){
      this.searchCtrl.valueChanges.debounceTime(700).subscribe(search => {
        this.searching = false;
        if (this.searchTerm !== ''){
           // do something 
         } else {
         this.hideDefaultList = false;
        }   
     }); 

  onSearchInput() {
     this.searching = true;
     this.showMessage = false;
     this.hideDefaultList = true;
   }

when closing keyboard , the function onSearchInput triggers again leading to show spinner this.searching