<section class="aae-menu" [class.main]="alias === 'main'">
  <div class="aae-header-wrapper">

    <nav>
      <a *ngFor="let item of menu" routerLink="/{{ item.alias }}" routerLinkActive="active">{{ item.name }}</a>
    </nav>

    <span class="aae-menu-social">
      <a href="#"><i class="fa fa-vk" aria-hidden="true"></i></a>
      <a href="#"><i class="fa fa-instagram" aria-hidden="true"></i></a>
    </span>

  </div>
</section>

<section *ngIf="menu" class="aae-menu" [class.main]="alias === 'main'">
  <div class="aae-header-wrapper">

    <nav>
      <a *ngFor="let item of menu" routerLink="/{{ item.alias }}" routerLinkActive="active">{{ item.name }}</a>
    </nav>

    <span class="aae-menu-social">
      <a href="#"><i class="fa fa-vk" aria-hidden="true"></i></a>
      <a href="#"><i class="fa fa-instagram" aria-hidden="true"></i></a>
    </span>

  </div>
</section>

Add condition on menu variable
Add condition on menu variable
