Fatal error: Uncaught Error: Call to undefined function wp_doing_ajax() in /wp-content/plugins/wordpress-seo/admin/onpage/class-onpage.php:78 Stack trace: #0 /wp-content/plugins/wordpress-seo/admin/onpage/class-onpage.php(271): WPSEO_OnPage::is_active() #1 /wp-content/plugins/wordpress-seo/admin/onpage/class-onpage.php(31): WPSEO_OnPage->catch_redo_listener() #2 /wp-content/plugins/wordpress-seo/wp-seo-main.php(342): WPSEO_OnPage->__construct() #3 /wp-includes/plugin.php(524): wpseo_init('') #4 /wp-settings.php(295): do_action('plugins_loaded') #5 /wp-config.php(92): require_once('/wp-settings.ph...') #6 /wp-load.php(39): require_once('/wp-config.php') #7 /wp-blog-header.php(13): require_once('/wp-load.php') #8 /index.php(17): require('/wp-blog-header...') #9 {main} thrown in /wp-content/plugins/wordpress-seo/admin/onpage/class-onpage.php on line 78