Discuz! 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.FileLineCode
1home.php41require_once(%s)
2source/module/home/home_follow.php255include(%s)
3data/template/137_diy_home_follow_feed.tpl.php823include(%s)
4data/template/137_137_home_space_col_small.tpl.php1discuz_database::fetch_all(%s)
5source/class/discuz/discuz_database.php100discuz_database::query(%s, Array, false, false)
6source/class/discuz/discuz_database.php136db_driver_mysql->query(%s, false, false)
7source/class/db/db_driver_mysql.php153db_driver_mysql->halt(%s, %d, %s)
8source/class/db/db_driver_mysql.php224break()
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