phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '27bf4f21eaeb374ad016a4f530b7d970' 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 ('27bf4f21eaeb374ad016a4f530b7d970', -1, 1771700808, 1771700808, 'd849d8dd', 2, 0, 0)

Line : 187
File : sessions.php