Database Error

I got this error from the server twice last night.  Does anyone know what it means?

Database error in The Thirteenth Frame

Query:

INSERT `sys_acl_levels_members` (`IDMember`, `IDLevel`, `DateStarts`, `DateExpires`, `TransactionID`) VALUES ('1100', '3', FROM_UNIXTIME(1351149188), FROM_UNIXTIME(1351753988), 'NULL')

Mysql error: Duplicate entry '1100-3-2012-10-25 03:13:08' for key 'PRIMARY'

Found error in the file '/home/admin/public_html/inc/membership_levels.inc.php' at line 657.
Called 'db_res' function with erroneous argument #0.


Debug backtrace:

Array
(
    [1] => Array
        (
            [file] => /home/admin/public_html/inc/classes/BxDolDb.php
            [line] => 253

It means that someone tried to do something more than one time. Any time a user repeats an activity the database will throw this error msg to your email. I get these all the time, when someone clicks something more than once or edits something that is already edited or even tries to friend someone who they're already friends with. (Which means that there's a flaw in Dolphin that people can't tell when an action they've performed has completed properly, but oh well! lol)

AWESOME!! Thank-you so much for the reply.  That's one less thing I have to worry about!!