Fatal error: Uncaught Error: Call to undefined function is_customize_preview() in /kunden/432483_3464/webseiten/wordpress/fkawpc/themes/customify/inc/customizer/configs/upsell.php:2 Stack trace: #0 /kunden/432483_3464/webseiten/wordpress/fkawpc/themes/customify/inc/class-customify.php(505): require_once() #1 /kunden/432483_3464/webseiten/wordpress/fkawpc/themes/customify/inc/class-customify.php(419): Customify->load_configs() #2 /kunden/432483_3464/webseiten/wordpress/fkawpc/themes/customify/inc/class-customify.php(602): Customify->includes() #3 /kunden/432483_3464/webseiten/wordpress/fkawpc/themes/customify/inc/class-customify.php(63): Customify->init() #4 /kunden/432483_3464/webseiten/wordpress/fkawpc/themes/customify/functions.php(74): Customify::get_instance() #5 /kunden/432483_3464/webseiten/wordpress/fkawpc/themes/customify/functions.php(77): Customify() #6 /kunden/432483_3464/webseiten/wordpress/wp-settings.php(328): include('/kunden/432483_...') #7 /kunden/432483_3464/webseiten/wordpress/wp-config.php(93): require in /kunden/432483_3464/webseiten/wordpress/fkawpc/themes/customify/inc/customizer/configs/upsell.php on line 2