lib/WikiDB/backend/PearDB.php:1014: Error: WikiDB_backend_PearDB_mysql: fatal database error

• DB Error: already exists
• (INSERT INTO session (sess_id, sess_data, sess_date, sess_ip) VALUES ('cdd364231898b0a671ce6704a1360fce', 'wiki_user|N;', 1283994888, '38.107.191.86') [nativecode=1062 ** Duplicate entry 'cdd364231898b0a671ce6704a1360fce' for key 1])