Database Error!

Error: Field 'last_seen' doesn't have a default value
Query: INSERT INTO users (uid, password, ip_address, first_seen) VALUES ("5d8825c9849f20.47304340", "ovy7ek0MjqJb11DwQuCtwWFw3nrdulsj", "3.227.233.55", UNIX_TIMESTAMP())
File: /includes/database.class.php
Line: 98
Backtrace: