phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'a9c31bdede7fee5cb1f6afc22a96b168' 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 ('a9c31bdede7fee5cb1f6afc22a96b168', -1, 1767206283, 1767206283, 'd849d803', -9, 0, 0)

Line : 187
File : sessions.php