phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f6955e953d51cf0c99e5389251d9987c' for key 1

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('f6955e953d51cf0c99e5389251d9987c', -1, 1219353636, 1219353636, '26673f3d', 275, 0, 0)

Line : 193
File : sessions.php