Database Error!

Error: Field 'last_seen' doesn't have a default value
Query: INSERT INTO users (uid, password, ip_address, first_seen) VALUES ("5c682251a83105.92816207", "aAQTxIml51YU4FqvK7pL0aN4dnsRSltm", "34.207.152.62", UNIX_TIMESTAMP())
File: /includes/database.class.php
Line: 98
Backtrace: