never seen this before..

I am getting an error when inserting data into a mysql database table. It is telling me that there is a duplicate entry in the database everytime it gets 10 records inserted to the table, if I flush the table and try it again it works fine. Is there some kind of limit on some tables? Here is the error php outputs once the table gets 10 records: Duplicate entry '10' for key 1 Here is the code... require '/home/web/b/bignickel.net/scripts/admin/db.php'; $table = "demo_sessions"; $sql_insert = "INSERT INTO $table (ipaddy,date) VALUES ('$ipaddy','$date')" or die('Could not insert client info'); $result = @mysql_query($sql_insert,$dbh) or die(MYSQL_ERROR()); Any help on this would be great TIA Jas