phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'dfd08d555a4b041b21bf01a0769ee4a7' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('dfd08d555a4b041b21bf01a0769ee4a7', -1, 1770138205, 1770138205, 'd849d8b9', 6, 0, 0)

Line : 187
File : sessions.php