Fatal error: Uncaught Error: Call to undefined function is_plugin_active() in /www/doc/www.ddfu.cz/www/wp-content/plugins/wordpress-seo/src/dashboard/infrastructure/integrations/site-kit.php:94 Stack trace: #0 /www/doc/www.ddfu.cz/www/wp-content/plugins/wordpress-seo/src/conditionals/third-party/site-kit-conditional.php(35): Yoast\WP\SEO\Dashboard\Infrastructure\Integrations\Site_Kit->is_enabled() #1 /www/doc/www.ddfu.cz/www/wp-content/plugins/wordpress-seo/src/loader.php(270): Yoast\WP\SEO\Conditionals\Third_Party\Site_Kit_Conditional->is_met() #2 /www/doc/www.ddfu.cz/www/wp-content/plugins/wordpress-seo/src/loader.php(208): Yoast\WP\SEO\Loader->conditionals_are_met('Yoast\\WP\\SEO\\Da...') #3 /www/doc/www.ddfu.cz/www/wp-includes/class-wp-hook.php(324): Yoast\WP\SEO\Loader->load_integrations('') #4 /www/doc/www.ddfu.cz/www/wp-includes/class-wp-hook.php(348): WP_Hook->apply_filters(NULL, Array) #5 /www/doc/www.ddfu.cz/www/wp-includes/plugin.php(517): WP_Hook->do_action(Array) #6 /www/doc/www.ddfu.cz/www/wp-settings.php(704): do_action('init') #7 /www/doc/www.ddfu.cz/www/wp-config.php(101): require_once('/www/doc/www.dd...') #8 /www/doc/www.ddfu.cz/www/wp-load.php(50): require_once('/www/doc/www.dd...') #9 /www/doc/www.ddfu.cz/www/wp-blog-header.php(13): require_once('/www/doc/www.dd...') #10 /www/doc/www.ddfu.cz/www/index.php(17): require('/www/doc/www.dd...') #11 {main} thrown in /www/doc/www.ddfu.cz/www/wp-content/plugins/wordpress-seo/src/dashboard/infrastructure/integrations/site-kit.php on line 94