PHP:
Fatal error: Uncaught Error: Class "WP_Customize_Section" not found in /www/habi.gna.ch/doc/wp-includes/customize/class-wp-customize-nav-menu-section.php:19
Stack trace:
#0 {main}
thrown in /www/habi.gna.ch/doc/wp-includes/customize/class-wp-customize-nav-menu-section.php on line 19