Adding a new menu a search form appears (?)

Hello. I’m working on my blog here: https://pauvlog.com

The thing is that I added a non existen menu, and as you can see it works. The problem is that the code also adds a search form. I just cannot get it..

The header code is the following:

<div class="secondary-navigation">
						<nav id="navigation">
    						<?php
       				 			wp_nav_menu( array('theme_location' => 'primary-menu', 'menu_class' => 'menu', 'container' => '') ); ?>
						</nav></div>

Thanks guys

https://www.ads-software.com/plugins/menu/