Error

SQL query:

INSERT INTO `mail` ( `id` , `messageType` , `sender` , `receiver` , `subject` , `itemTextId` , `item_guid` , `item_template` , `expire_time` , `deliver_time` , `money` , `cod` , `checked` )
VALUES (
'', 0, 0, '3', 'Testing mailsystem', 1, 207, 14156, 1181046686, 1178454686, 1000000, 0, 0
);

MySQL said: Documentation
#1062 - Duplicate entry '0' for key 1