www.optbbs.com - Database Error

(1064) You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'AND attachment>0 order by dateline desc limit 0,6' at line 1

select tid,subject from forum_thread where authorid = AND attachment>0 order by dateline desc limit 0,6

PHP Debug

No.	File	Line	Code
1	home.php	41	require_once(%s)
2	source/module/home/home_follow.php	255	include(%s)
3	data/template/137_diy_home_follow_feed.tpl.php	823	include(%s)
4	data/template/137_137_home_space_col_small.tpl.php	1	discuz_database::fetch_all(%s)
5	source/class/discuz/discuz_database.php	100	discuz_database::query(%s, Array, false, false)
6	source/class/discuz/discuz_database.php	136	db_driver_mysql->query(%s, false, false)
7	source/class/db/db_driver_mysql.php	153	db_driver_mysql->halt(%s, %d, %s)
8	source/class/db/db_driver_mysql.php	224	break()

Discuz! Database Error