Database Error!

Error: Field 'last_seen' doesn't have a default value
Query: INSERT INTO users (uid, password, ip_address, first_seen) VALUES ("5cc33bfac079c0.25797275", "10VI1un28GKiXMpJGclgkNgVslAkXWZm", "3.95.23.35", UNIX_TIMESTAMP())
File: /includes/database.class.php
Line: 98
Backtrace: