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Fatal error: Uncaught Error: Call to undefined function wp_doing_ajax() in /var/www/sites/nkdesign.pro/wp-includes/update.php:1145 Stack trace: #0 /var/www/sites/nkdesign.pro/wp-settings.php(188): require() #1 /var/www/sites/nkdesign.pro/wp-config.php(86): require_once('/var/www/sites/...') #2 /var/www/sites/nkdesign.pro/wp-load.php(50): require_once('/var/www/sites/...') #3 /var/www/sites/nkdesign.pro/wp-blog-header.php(13): require_once('/var/www/sites/...') #4 /var/www/sites/nkdesign.pro/index.php(17): require('/var/www/sites/...') #5 {main} thrown in /var/www/sites/nkdesign.pro/wp-includes/update.php on line 1145