Fatal error: Uncaught Error: Call to undefined function is_product() in /home/yktn/public_html/wp-content/plugins/oneclick-whatsapp-order/includes/buttons/wa-order-single-product.php:539 Stack trace: #0 /home/yktn/public_html/wp-includes/class-wp-hook.php(303): wa_order_force_show_atc_button('') #1 /home/yktn/public_html/wp-includes/class-wp-hook.php(327): WP_Hook->apply_filters(NULL, Array) #2 /home/yktn/public_html/wp-includes/plugin.php(470): WP_Hook->do_action(Array) #3 /home/yktn/public_html/wp-includes/general-template.php(3015): do_action('wp_head') #4 /home/yktn/public_html/wp-content/themes/one-page-express-pro/header.php(8): wp_head() #5 /home/yktn/public_html/wp-includes/template.php(770): require_once('/home/yktn/publ...') #6 /home/yktn/public_html/wp-includes/template.php(716): load_template('/home/yktn/publ...', true, Array) #7 /home/yktn/public_html/wp-includes/general-template.php(48): locate_template(Array, true, true, Array) #8 /home/yktn/public_html/wp-content/themes/one-page-express/inc/functions.php(4 in /home/yktn/public_html/wp-content/plugins/oneclick-whatsapp-order/includes/buttons/wa-order-single-product.php on line 539