Deleting a movie clip

[Sunflyer]

I deleted the categories first, but I realised that the movies was just being moved to another category so I tried deleting the movie. When I click yes to delete the movie I get this sql error

Database error in vBulletin 3.7.3:

Invalid SQL:
DELETE FROM vb3_thread
				WHERE threadid =;

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 2
Error Number  : 1064
Request Date  : Thursday, October 9th 2008 @ 08:33:27 PM
Error Date    : Thursday, October 9th 2008 @ 08:33:27 PM
Script        : http://************/vbtube_action.php?do=del&tubeid=0&delstop=1
Referrer      : http://************/vbtube_action.php?do=delstop&tubeid=
IP Address    : 000.000.000.000
Username      : Username
Classname     : vB_Database
MySQL Version : 5.0.51a-community-log

[s7v7n]

If you delete a Category vbtubepro deletes not the Videos.
What happens if you go to My Videos and trying deleting there ?