phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'f9d53b9d6fde57cff31f21ce383ead41' for key 'phpbb_sessions.PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('f9d53b9d6fde57cff31f21ce383ead41', -1, 1770938108, 1770938108, 'd849d821', -9, 0, 0)

Line : 187
File : sessions.php