Click Event not work sometime

Hi All,
I have a strange problem and I need your help.

Sometimes the buttons are touched (they display the animations) but the click events aren’t triggered.
here is code please check and help me

Thank you!

<button ion-button  class="buttonCenter" tappable round (click)="session()" *ngIf="user" >Generate</button>
<button ion-button  class="buttonCenter" round (click)="session()" *ngIf="user" >Generate</button>
alert("Hello World);
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