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 ('642f726fbd0d1d4eff389d6b7c266a9b', '54.204.106.194', 'CCBot/2.0 (http://commoncrawl.org/faq/)', 1487768570)