Flash message shows after clicking, go back and go forward browser button

I have shown flash message once request is received from the server. If a users click go back and go forward button simultaneously... He again sees the same flash message which I think it's a bad message to the users... How can I solve this issue?

I have achieved this problem using follwing code

  <script>
   @if(!empty(Session::get('message')))
    var popupId = "{{ uniqid() }}";
    if(!sessionStorage.getItem('shown-' + popupId)) {
        swal({
            html:
            "{{Session::get('message')}}",
            showCloseButton: true,
            showCancelButton: false,
            showConfirmButton: false,
            animation: false,
            customClass: 'animated tada',
            focusConfirm: false,
            background: '#008eb0'
        });
    }
    sessionStorage.setItem('shown-' + popupId, '1');
    @endif
</script>