Error in WP_Admin - LiveStream

Hi guys I've just noticed in WP_Admin an error being generated very frequently, over and over:

FROM wp_comments c WHERE 1 AND c.comment_approved = 1 AND post_published_stamp > 1362045781 ORDER BY c.comment_date_gmt DESC LIMIT 10 made by do_action('wp_ajax_live_stream_update_ajax'), call_user_func_array, live_stream_update_ajax_proc, live_stream_get_post_items, W3_Db->query, W3_DbCache->query, W3_DbCallUnderlying->query, W3_Db->query, W3_DbProcessor->query, W3_Db->default_query
[28-Feb-2013 11:40:45 UTC] WordPress database error Unknown column 'post_published_stamp' in 'where clause' for query SELECT
c.comment_post_ID as post_id,
c.user_id as post_author_id,
c.comment_content as comment_content,
c.comment_author as post_author_name,
c.comment_author_email as post_author_email,
c.comment_date_gmt as post_published_stamp,
c.comment_ID as comment_id

Any ideas?

Thanks
Rob.