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 ('51fe65662a18948e4ec226b1c136f615', '54.80.209.254', 'CCBot/2.0 (http://commoncrawl.org/faq/)', 1508765015)