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 ('7e388936887034ac0fe5bebe7d0bc4b9', '54.211.62.139', 'CCBot/2.0 (http://commoncrawl.org/faq/)', 1481317774)