Resticting user adding a signature

[jae]

Your phpBB Version: 2.0.
phpBB Type: Standard phpBB
MODs: No
Your knowledge: Beginner
Board URL: http://www.scifi-talk.net/portal.php

PHP Version:
MySQL Version:


What was done before the problem appeared?



What was done to try to solve the problem?




De.scription and Message

Hello

I have set the option in user control so that a certain member(s) can not set a signature but instead of it saying something like "you do not have access to this facility" it shows the following

Could not update user table

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 'WHERE user_id = 21' at line 3

UPDATE phpbb_users SET WHERE user_id = 21

Line : 444
File : profilcp_profil_signature.php

Can you please tell me why this happens and a fix if possible?