database error

[soft2day]

I am having a problem that the forum has been transformed from ipb script to vbulltin script
Since then, many in topic when user open it Received a letter on email
vBulletin Database Error!
Content of the message

Database error in vBulletin 3.7.0:

Invalid SQL:
SELECT COUNT(threadid) AS total FROM thread WHERE postuserid=;

MySQL Error : 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 1
Error Number : 1064
Request Date : Sunday, July 27th 2008 @ 01:19:12 PM
Error Date : Sunday, July 27th 2008 @ 01:19:12 PM
Script : http://www.soft2day.com/vb/showthread.php?t=2935
Referrer :
IP Address : 66.249.71.118
Username : غير مسجل
Classname : vB_Database
MySQL Version :

the forum work well in other topics
whait u

[Steve Machol]

Invalid SQL errors are almost always related to modified code.

To troubleshoot this, first reupload all the original vB non-image files (except install.php). Make sure you upload these in ASCII format and overwrite the ones on the server. Also be sure to upload the admincp files to whichever directory you have set in your config.php file. Then run 'Suspect File Versions' in Diagnostics to make sure you have all the original files for your version and that none show 'File does not contain expected contents':

Admin CP -> Maintenance -> Diagnostics -> Suspect File Versions

[Note: In some cases you may also need to remove any of the listed .xml files in the includes/xml directory.]

Next, disable all plugins.

Note: To temporarily disable the plugin system, edit config.php and add this line right under <?php

define('DISABLE_HOOKS', true);

Then if you still have this problem, create a new style and choose no parent style. This will force it to use the default templates. Finally empty your browser cache, close all browser windows then try again. Make sure you change to the new style and view your forums with it. Do you have the same problem?