phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '64cf5a5f9ba3c01a0d1ab22c1e4b4829' 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 ('64cf5a5f9ba3c01a0d1ab22c1e4b4829', -1, 1768490956, 1768490956, 'd849d868', -4, 0, 0)

Line : 187
File : sessions.php