Fatal error: Uncaught Error: Call to undefined function wp_is_json_request() in /wp-includes/functions.php:3712
Stack trace:
#0 /wp-includes/functions.php(5412): wp_die('<h1>Error estab...', 'Database Error')
#1 /wp-includes/load.php(422): dead_db()
#2 /wp-settings.php(110): wp_set_wpdb_vars()
#3 /wp-config.php(89): require_once('/wp-settings.ph...')
#4 /wp-load.php(37): require_once('/wp-config.php')
#5 /wp-login.php(12): require('/wp-load.php')
#6 {main}
thrown in /wp-includes/functions.php on line 3712