Database Error!

Error: Field 'last_seen' doesn't have a default value
Query: INSERT INTO users (uid, password, ip_address, first_seen) VALUES ("5e5616175a2d03.03773504", "0qyTAVMb6vX27pmEjDM0vPLAQ9FHARcW", "34.204.191.0", UNIX_TIMESTAMP())
File: /includes/database.class.php
Line: 98
Backtrace: