Fatal error: Uncaught Error: Class "WP_Customize_Setting" not found in /usr/home/AriesPB/domains/elektrobud-koszalin.pl/public_html/wp-includes/customize/class-wp-customize-custom-css-setting.php:19
Stack trace:
#0 {main}
  thrown in /usr/home/AriesPB/domains/elektrobud-koszalin.pl/public_html/wp-includes/customize/class-wp-customize-custom-css-setting.php on line 19