phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'dadef9a0e205dd35f24e4fed77aeb9ad' 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 ('dadef9a0e205dd35f24e4fed77aeb9ad', -1, 1775934432, 1775934432, '2d971ed8', -9, 0, 0)

Line : 187
File : sessions.php