phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'bff62fee9a0608bf255482ec795cf7ac' 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 ('bff62fee9a0608bf255482ec795cf7ac', -1, 1768778858, 1768778858, 'd849d87e', -4, 0, 0)

Line : 187
File : sessions.php