Hijack Wordpress menu to insert shop link

hijackmenu.php

<?php 

//  Hijack menu to insert vendor shop link. 
add_filter('wp_nav_menu_items', 'vendor_shop_link', 10, 2); 

function vendor_shop_link($items, $args) {

	    $wcv_settings = get_option('wc_prd_vendor_options');
	    $wcv_perm = $wcv_settings['vendor_shop_permalink']; 
		
	    // This assumes that this menu is only visible to vendors 
	    // Change the menu reference on the next line 
	    if( is_user_logged_in() && ( $args->menu->slug == 'insert-your-menu-name-here' ) ) {

	    	$shop = get_userdata( get_current_user_id() ); 
		$shop_link = site_url($wcv_perm.'/' .$shop->pv_shop_slug );
			
		$sp = '<li><a title="View Shop" href="'.$shop_link .'">View Shop</a></li>';

	        $newitems = $sp . $items;// enqueue regular menu item
	        
	        return $newitems;
	    }

	    // for menus other than 'header-menu', get regular menu
	    return $items;
}
?>