Getting Database error over my site

Hello, 

can anybody help me to solve this problem?

I have received 35 mails (auto generated by my site ) telling me that my site is having a database error.

Mail look like this:-

INSERT INTO `sys_profiles_match`(`profile_id`, `sort`, `profiles_match`) VALUES(15885, 'none', 'a:0:{}')

Mysql error: Duplicate entry '15885-none' for key 'profile_id'

No expert to solve this ????

For some reason its adding the profile_id and sort together on the insert.  

 '15885-none'

This could be a bot joining with the same details as well ?

 Thanks for the reply , It was really the same.

Millions thanks again.