Fatal error: Uncaught Error: Call to undefined function is_shop() in /www/htdocs/w010818c/wp-content/plugins/my-custom-functionality/plugin.php:55 Stack trace: #0 /www/htdocs/w010818c/wp-includes/class-wp-hook.php(287): woocommerce_hide_non_registered('') #1 /www/htdocs/w010818c/wp-includes/class-wp-hook.php(311): WP_Hook->apply_filters(NULL, Array) #2 /www/htdocs/w010818c/wp-includes/plugin.php(478): WP_Hook->do_action(Array) #3 /www/htdocs/w010818c/wp-includes/template-loader.php(13): do_action('template_redire...') #4 /www/htdocs/w010818c/wp-blog-header.php(19): require_once('/www/htdocs/w01...') #5 /www/htdocs/w010818c/index.php(17): require('/www/htdocs/w01...') #6 {main} thrown in /www/htdocs/w010818c/wp-content/plugins/my-custom-functionality/plugin.php on line 55