phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'd8551ebcc23cc69cf1daadc5e397f813' 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 ('d8551ebcc23cc69cf1daadc5e397f813', -1, 1771263654, 1771263654, 'd849d8a7', 3, 0, 0)

Line : 187
File : sessions.php