Database Error!

Error: Field 'last_seen' doesn't have a default value
Query: INSERT INTO users (uid, password, ip_address, first_seen) VALUES ("5d8826ba4bfd35.52573122", "I5xbHh5Q7N01Bc1iHPLY5pkWY7ojTD4r", "3.227.233.55", UNIX_TIMESTAMP())
File: /includes/database.class.php
Line: 98
Backtrace: