A Database Error Occurred

Error Number: 1364

Field 'user_data' doesn't have a default value

INSERT INTO `ci_sessions` (`session_id`, `ip_address`, `user_agent`, `last_activity`) VALUES ('f999a3ba76931d1a6a41be0a4f2fe5b7', '54.158.30.143', 'CCBot/2.0 (http://commoncrawl.org/faq/)', 1493394859)