Whenever a user ( who is not an admin ) post on another users wall

i'll get this error

An unrecoverable error has occurred and has been logged. Contact the site administrator with the following information:

Exception #1359363399.

i have search the elgg comunntiy and it turns out that i am not the only one having this problem

i have also tried fixing it myself but i'm not fimiliar with how to go about fixing this kind of stuff

i opened the composer.php in the messageboard folder of the facebook theme 

<?php
//hack! Elgg engine should take care of this, or blog/save form should be coded better
if (elgg_is_xhr() && isset($vars['entity_guid'])) {
elgg_set_page_owner_guid($vars['entity_guid']);
}
echo elgg_view_form('messageboard/add', array(), $vars);

Does anyone have any idea on how to fix this?

it seems to only happen when i post on a user's mesageboard / wall 

when i log in as admin it works fine. i can post on anyone's wall but whenever a normal user does it

it gives me that error.

Please Help 

i appreciate it :)

i ran into 4 topics that also had this problem

also, i know it's the theme because whenever i disable it it'll work fine and i can comment on a user's wall