MySQL Error Occured

Error Message:
1062: Duplicate entry 'f43be9a091cc32e7e3b536294ee6c037' for key 1

SQL:
INSERT INTO cube_CubeCart_sessions (`sessId`,`timeStart`,`timeLast`,`customer_id`,`ip`,`browser`) VALUES ('f43be9a091cc32e7e3b536294ee6c037','1268962260','1268962260',0,'38.107.191.85','CCBot/1.0 (+http://www.commoncrawl.org/bot.html)');