Proxy mod errors ?

[Necrosaro420]

I keep getting this error, I have several proxy mods installed to stop people from using proxies. I cant tell which it is from this, maybe one of you all will know.

Here are the ones I currently have installed:

Products:
DNSBL/Open Proxy Monitoring
Multiple Login Detector
Real ip detection




Database error in vBulletin 3.5.4:

Invalid SQL:
INSERT INTO proxycache (ip, listed, dateline) VALUES ('xx.xxx.xxx.xxx', 0, 1160403401);

MySQL Error : Duplicate entry 'xx.xxx.xxx.xxx' for key 1
Error Number : 1062
Date : Monday, October 9th 2006 @ 10:16:45 AM
Script : http://www.xxxxxxxx.com/showthread.php?p=13183
Referrer :
IP Address : xx.xxx.xxx.xxx
Username : Unregistered
Classname : vb_database