Please post support questions to the plugin’s Homepage at https://shinraholdings.com/plugins/add-comments. You will get a much quicker answer if you post it there, thanks.
]]>in this func, i think you need a check for empty:
function addComments_add_comments( $id, $author, $email, $url, $ip, $comments ) {
$explodes = explode( '%*%', $comments );
foreach( $explodes as $comment )
if($comment == '')continue;