Fatal error: Uncaught Error: Call to undefined function is_cart() in /home/customer/www/shop.funstkunst.de/public_html/wp-content/plugins/woocommerce-germanized/includes/class-wc-gzd-checkout.php:188
Stack trace:
#0 /home/customer/www/shop.funstkunst.de/public_html/wp-includes/class-wp-hook.php(307): WC_GZD_Checkout->maybe_remove_shopmark_filters('')
#1 /home/customer/www/shop.funstkunst.de/public_html/wp-includes/class-wp-hook.php(331): WP_Hook->apply_filters(NULL, Array)
#2 /home/customer/www/shop.funstkunst.de/public_html/wp-includes/plugin.php(476): WP_Hook->do_action(Array)
#3 /home/customer/www/shop.funstkunst.de/public_html/wp-includes/template-loader.php(13): do_action('template_redire...')
#4 /home/customer/www/shop.funstkunst.de/public_html/wp-blog-header.php(19): require_once('/home/customer/...')
#5 /home/customer/www/shop.funstkunst.de/public_html/index.php(17): require('/home/customer/...')
#6 {main}
thrown in /home/customer/www/shop.funstkunst.de/public_html/wp-content/plugins/woocommerce-germanized/includes/class-wc-gzd-checkout.php on line 188