Function in comments.php doesn't work with Wpdiscuz

In comments.php file, I have this snippet to limit the number of comments a user can submit per day.

<?php 
global $wpdb,$current_user;
$limit = 1; //this is limit per day per user
$comment_count = $wpdb->get_var( $wpdb->prepare("
SELECT count(*)
FROM wp_comments 
WHERE comment_author = '%s'
AND comment_date >= DATE_SUB(NOW(),INTERVAL 1 DAY);"
,$current_user->user_login) );

if($comment_count < $limit) {
echo 'You submited '.$comment_count.' comment(s) from '.$limit.' available '; 
comment_form( hestia_comments_template() );
} 
else {
echo 'You have reached your comments daily limit : '.$limit;
}
?>

This code work perfectly with WP core comment system, but when switch to wpdiscuz, it doesn't work at all.
Any suggestion or change to let wpdiscuz supports this code.
Thanks