TeleTet : Critical Error

Error creating new session

DEBUG MODE

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

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('0d8c02c309ef3dd54e16e81697861d5a', -1, 1414186808, 1414186808, '36d34484', -1, 0, 0)

Line : 189
File : sessions.php