Database Error!

Error: Field 'last_seen' doesn't have a default value
Query: INSERT INTO users (uid, password, ip_address, first_seen) VALUES ("5cc33ecc96ce97.47526863", "nX94h2DY7hLvPOkBc6mBcHSRJQ2fGx9e", "3.95.23.35", UNIX_TIMESTAMP())
File: /includes/database.class.php
Line: 98
Backtrace: