Mysql error Beim erstellen von Foren und Ändern

[Kampf-Nudel]

Immer wenn ich Forum erstelle,
Oder die alten probiere zu löschen bekomme ich folgende Meldung:

There seems to have been a problem with the FORUM database.
Please try again by clicking the Refresh button in your web browser.

An E-Mail has been dispatched to our Technical Staff, who you can also contact if the problem persists.

We apologise for any inconvenience.
Database error in vBulletin 3.5.0 Beta 2:

Invalid SQL:

UPDATE forum SET
parentlist =
CASE forumid

ELSE parentlist
END,
childlist =
CASE forumid

ELSE childlist
END;

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 'ELSE parentlist
END,
childlist =
CASE forumid

ELSE childlist
' at line 5
Error Number : 1064
Date : Thursday, June 23rd 2005 @ 03:18:59 PM
Script : http://domain.tld.de/FORUM/admincp/forum.php
Referrer : http://DOMAIN.TLD/FORUM/admincp/forum.php?do=edit&f=1
IP Address : XX.XXX.XXX
Username : XXXXXX
Classname : vb_database
was kann ich machen um dies zu korigieren?