phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '6fcbb0fae3c4a073fe57c5766b058b24' for key 1

INSERT INTO phpbb2_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6fcbb0fae3c4a073fe57c5766b058b24', -1, 1369400904, 1369400904, 'b8494a2f', 19, 0, 0)

Line : 187
File : sessions.php