Database Error!

Error: Field 'last_seen' doesn't have a default value
Query: INSERT INTO users (uid, password, ip_address, first_seen) VALUES ("5d37b4a302bd59.90085123", "KEkLZZeXMyBc5BgPIOluH3ku5hXfambA", "3.84.139.101", UNIX_TIMESTAMP())
File: /includes/database.class.php
Line: 98
Backtrace: