[問題] 請問SQL版本不夾會導致這個問題呢?

[vaio]

問題外掛：N/A
參考連結：N/A
使用版本：phpbb 2.0.10
網站位置：因為公司用途，所以不更公開，敬請原諒‧
狀況描述：不知甚麼原因做會出現已下的Error Message，請各位大大幫幫小弟呢 >.<

Could not delete group for this user

DEBUG MODE

SQL 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 '' at line 2

DELETE FROM phpbb_groups WHERE group_id =

Line : 256
File : c:\appserv\www\phpbb2\admin\admin_userlist.php