Hi, Gheorghe

You have this:

        this.subscription = this.footerService.submit$.subscribe(value => 
value === true ? this.onSubmit() : null);
        this.subscription = this.footerService.sendMail$.subscribe(value => 
value === true ? this.popup.open() : null);

and this:

    ngOnDestroy() {
        this.subscription.unsubscribe();
    }

Thing is, you can't store 2 different subscriptions into 1 instance 
variable. The second one is overwriting the first, and you are only 
unsubscribing the last one.

Regards
Sander

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