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 'WHERE `nid`='602120033370'' at line 1

UPDATE `tk_detail_622` SET WHERE `nid`='602120033370'

PHP Debug

No.	File	Line	Code
1	irobots.php	25	require_once(%s)
2	source/module/action/TbkViewItem.php	280	discuz_database::query(%s)
3	source/class/discuz/discuz_database.php	139	db_driver_mysql->query(%s, false, false)
4	source/class/db/db_driver_mysql.php	152	db_driver_mysql->halt(%s, %d, %s)
5	source/class/db/db_driver_mysql.php	223	break()