phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a27df0e5503c51bb6f054ac33ad821e6' 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 ('a27df0e5503c51bb6f054ac33ad821e6', -1, 1770741857, 1770741857, 'd849d821', -9, 0, 0)

Line : 187
File : sessions.php