phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 2

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('b4d054b74bf0fe8ec6650de40bacc4b4', -1, 1414064513, 1414064513, '36a7abba', 29, 0, 0)

Line : 187
File : sessions.php