Fatal error: Uncaught Error: Call to undefined function is_checkout() in /home/bigamusic.eu/domains/zadiestore.hu/public_html/wp-content/plugins/checkout-fees-for-woocommerce/includes/class-alg-wc-checkout-fees.php:255 Stack trace: #0 /home/bigamusic.eu/domains/zadiestore.hu/public_html/wp-includes/class-wp-hook.php(286): Alg_WC_Checkout_Fees->enqueue_checkout_script('') #1 /home/bigamusic.eu/domains/zadiestore.hu/public_html/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #2 /home/bigamusic.eu/domains/zadiestore.hu/public_html/wp-includes/plugin.php(465): WP_Hook->do_action(Array) #3 /home/bigamusic.eu/domains/zadiestore.hu/public_html/wp-includes/script-loader.php(2537): do_action('wp_enqueue_scri...') #4 /home/bigamusic.eu/domains/zadiestore.hu/public_html/wp-includes/class-wp-hook.php(286): wp_enqueue_scripts('') #5 /home/bigamusic.eu/domains/zadiestore.hu/public_html/wp-includes/class-wp-hook.php(310): WP_Hook->apply_filters(NULL, Array) #6 /home/bigamusic.eu/domains/zadiestore.hu/public_html/ in /home/bigamusic.eu/domains/zadiestore.hu/public_html/wp-content/plugins/checkout-fees-for-woocommerce/includes/class-alg-wc-checkout-fees.php on line 255