Introducing the new Jumpstart brand

Fatal error: Uncaught TypeError: property_exists(): Argument #1 ($object_or_class) must be of type object|string, array given in /home/public/wp-content/themes/stoble-workplace/admin/theme_filters.php:413 Stack trace: #0 /home/public/wp-content/themes/stoble-workplace/admin/theme_filters.php(413): property_exists(Array, 'list_item_class') #1 /home/public/wp-includes/class-wp-hook.php(312): tommusrhodus_add_menu_list_item_class(Array, Object(WP_Post), Array) #2 /home/public/wp-includes/plugin.php(205): WP_Hook->apply_filters(Array, Array) #3 /home/public/wp-content/themes/stoble-workplace/admin/theme_menus_widgets.php(223): apply_filters('nav_menu_css_cl...', Array, Object(WP_Post), Array, 0) #4 /home/public/wp-includes/class-wp-walker.php(147): WP_Bootstrap_Navwalker->start_el('', Object(WP_Post), 0, Array, 0) #5 /home/public/wp-content/themes/stoble-workplace/admin/theme_menus_widgets.php(388): Walker->display_element(Object(WP_Post), Array, 1, 0, Array, '') #6 /home/public/wp-includes/class-wp-walker.php(247): WP_Bootstrap_Navwalker->display_element(Object(WP_Post), Array, 1, 0, Array, '') #7 /home/public/wp-includes/post-template.php(1572): Walker->walk(Array, 1, Array, 0) #8 /home/public/wp-includes/post-template.php(1355): walk_page_tree(Array, 1, 0, Array) #9 /home/public/wp-includes/post-template.php(1487): wp_list_pages(Array) #10 /home/public/wp-includes/nav-menu-template.php(164): wp_page_menu(Array) #11 /home/public/wp-content/themes/stoble-workplace/inc/side-menu.php(22): wp_nav_menu(Object(stdClass)) #12 /home/public/wp-includes/template.php(787): require('/home/public/wp...') #13 /home/public/wp-includes/template.php(720): load_template('/home/public/wp...', false, Array) #14 /home/public/wp-includes/general-template.php(206): locate_template(Array, true, false, Array) #15 /home/public/wp-content/themes/stoble-workplace/footer.php(2): get_template_part('inc/side-menu') #16 /home/public/wp-includes/template.php(785): require_once('/home/public/wp...') #17 /home/public/wp-includes/template.php(720): load_template('/home/public/wp...', true, Array) #18 /home/public/wp-includes/general-template.php(92): locate_template(Array, true, true, Array) #19 /home/public/wp-content/themes/stoble-workplace/index.php(8): get_footer() #20 /home/public/wp-includes/template-loader.php(106): include('/home/public/wp...') #21 /home/public/wp-blog-header.php(19): require_once('/home/public/wp...') #22 /home/public/index.php(17): require('/home/public/wp...') #23 {main} thrown in /home/public/wp-content/themes/stoble-workplace/admin/theme_filters.php on line 413