Fatal Error when “Search orders” result is empty

On the WooCommerce Orders page, entering a search term and clicking the “Search orders” button causes Ultimate Order Combinations plugin to throw a fatal error if the term is not found:

Fatal error: Uncaught Error: Call to a member function get_items() on bool in /usr/local/var/www/Sites/created-by-couture.com/public_html/wp-content/plugins/woo-ultimate-order-combination/inc/functions.php:1103 Stack trace: #0 /usr/local/var/www/Sites/created-by-couture.com/public_html/wp-includes/class-wp-hook.php(324): wuoc_admin_scripts(‘edit.php’) #1 /usr/local/var/www/Sites/created-by-couture.com/public_html/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #2 /usr/local/var/www/Sites/created-by-couture.com/public_html/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #3 /usr/local/var/www/Sites/created-by-couture.com/public_html/wp-admin/admin-header.php(118): do_action(‘admin_enqueue_s…’, ‘edit.php’) #4 /usr/local/var/www/Sites/created-by-couture.com/public_html/wp-admin/edit.php(411): require_once(‘/usr/local/var/…’) #5 {main} thrown in /usr/local/var/www/Sites/created-by-couture.com/public_html/wp-content/plugins/woo-ultimate-order-combination/inc/functions.php on line 1103

It appears that the code at functions.php line 1103 is not detecting that the $order_obj is empty before trying to call its get_items() function.

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