phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'b863670c55e8de0e6f4e279f8fc5f84e' 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 ('b863670c55e8de0e6f4e279f8fc5f84e', -1, 1769955550, 1769955550, 'd849d822', -4, 0, 0)

Line : 187
File : sessions.php