Fatal error: Uncaught Error: Call to undefined function is_cart() in /home/provif5/public_html/wp-content/themes/provif-theme/core/woocommerce/class-provif-wc-cart.php:18 Stack trace: #0 /home/provif5/public_html/wp-includes/class-wp-hook.php(341): PROVIF_WC_Cart->redirect_cart_to_checkout('') #1 /home/provif5/public_html/wp-includes/class-wp-hook.php(365): WP_Hook->apply_filters(NULL, Array) #2 /home/provif5/public_html/wp-includes/plugin.php(522): WP_Hook->do_action(Array) #3 /home/provif5/public_html/wp-includes/template-loader.php(23): do_action('template_redire...') #4 /home/provif5/public_html/wp-blog-header.php(19): require_once('/home/provif5/p...') #5 /home/provif5/public_html/index.php(17): require('/home/provif5/p...') #6 {main} thrown in /home/provif5/public_html/wp-content/themes/provif-theme/core/woocommerce/class-provif-wc-cart.php on line 18