doesn't work

i have the same version 2.2.9
but the code in newreply.php is :
PHP Code:
if ($visible) {
if ($threadinfo[replycount]%10==0) {
$replies=$DB_site->query_first("SELECT COUNT(*)-1 AS replies FROM post WHERE threadid='$threadid'");
$DB_site->query("UPDATE thread SET lastpost='".time()."',replycount='$replies[replies]',lastposter='".addslashes($postusername)."' WHERE threadid='$threadid'");
i replaced it with your code:
PHP Code:
if ($visible) {
if ($threadinfo[replycount]%10==0) {
$replies=$DB_site->query_first("SELECT COUNT(*)-1 AS replies FROM post WHERE threadid='$threadid'");
if($thread[slippery]) {
$DB_site->query("UPDATE thread SET replycount='$replies[replies]',lastposter='".addslashes($postusername)."' WHERE threadid='$threadid'");
} else {
$DB_site->query("UPDATE thread SET lastpost='".time()."',replycount='$replies[replies]',lastposter='".addslashes($postusername)."' WHERE threadid='$threadid'");
}
} else {
if($thread[slippery]) {
$DB_site->query("UPDATE thread SET replycount=replycount+1,lastposter='".addslashes($postusername)."' WHERE threadid='$threadid'");
} else {
$DB_site->query("UPDATE thread SET lastpost='".time()."',replycount=replycount+1,lastposter='".addslashes($postusername)."' WHERE threadid='$threadid'");
}
}
}
but now i get a blank page when i submit i new reply
any help?