A Database Error Occurred

Error Number: 1062

Duplicate entry '1406312397' for key 1

INSERT INTO sess_cart (data, user_id, last_activity, cartid) VALUES ('a:1:{s:9:\"290-17493\";a:3:{s:9:\"productid\";s:3:\"290\";s:11:\"inventoryid\";s:5:\"17493\";s:3:\"qty\";i:1;}}', 0, 1406312397, 1406312397)