Fatal error on registration

[MTGDarkness]

FFFFFFUUUUUUUU...

Database error in vBulletin 3.7.5:

Invalid SQL:
INSERT INTO testvb_userfield
(userid)
VALUES
(272);

MySQL Error : Duplicate entry '272' for key 1
Error Number : 1062
Request Date : Thursday, April 2nd 2009 @ 04:55:39 AM
Error Date : Thursday, April 2nd 2009 @ 04:55:40 AM
Script : http://forums.mtgdarkness.com/register.php?do=addmember
Referrer : http://forums.mtgdarkness.com/register.php
IP Address : 194.8.75.15
Username : Vikerwan
Classname : vB_Database


Just merged from another forum via ImpEx, and now I have this error... What do I do?

[MnTom]

Try looking here: http://www.vbulletin.com/forum/showthread.php?t=304429&highlight=1062

[MTGDarkness]

Thanks. :)

--------------- Added 1238700095 at 1238700095 ---------------

That did not do the job. Also, they aren't showing up as newly registered members either, but they join and can post normally... :(