Database Error!

Error: Field 'last_seen' doesn't have a default value
Query: INSERT INTO users (uid, password, ip_address, first_seen) VALUES ("5d8823e826deb1.31938868", "XZv66EwzIIA3BmGPLd1MUL2ZCs8nsFqQ", "3.227.233.55", UNIX_TIMESTAMP())
File: /includes/database.class.php
Line: 98
Backtrace: