Submenu not adding span with class dropdown-menu-toggle in mobile

In my theme when i view the moible menu there is span with class “dropdown-menu-toggle” is missing under parent menu “menu-item”

<li class="menu-item menu-item-type-post_type menu-item-object-page current-menu-item page_item page-item-42 current_page_item menu-item-has-children menu-item-76"><a href="/about/">About</a>
<ul class="sub-menu">
	<li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-372"><a href="/about/our-spa/">Our Spa</a></li>
	<li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-373"><a href="/about/dr-kolder/">Dr. Kolder</a></li>
	<li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-374"><a href="/about/our-team/">Our Team</a></li>
</ul>
</li>

As i see your demo mobile menu, i can clearly see the those span in sub menu items.

<li class="menu-item menu-item-type-post_type menu-item-object-page menu-item-has-children menu-item-1388 sfHover"><a href="http://demo.generatepress.com/sample-page/">Sample<span role="button" class="dropdown-menu-toggle" aria-expanded="true" tabindex="0"></span></a><ul class="sub-menu toggled-on"><li class="menu-item menu-item-type-custom menu-item-object-custom menu-item-has-children menu-item-1389"><a href="#">Sub Page 1<span role="button" class="dropdown-menu-toggle" aria-expanded="false" tabindex="0"></span></a> .....

Also i am facing the js error when i click on toggle menu in mobile

Uncaught TypeError: Cannot read property ‘setAttribute’ of null at HTMLButtonElement.<anonymous> (menu.min.js?ver=2.0.2:1)

https://s45dev.com/pacificamedicalspa/camarillo/about/

Please help me to fix this issue.

Thanks alot

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