phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c8d9b252f9990759a49fd482f997c1b5' 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, priv_session_id) VALUES ('c8d9b252f9990759a49fd482f997c1b5', -1, 1784770871, 1784770871, '6817f34b', 2, 0, 0, '077e474529b4269ec9382bbef6d661e7')

Line : 188
File : sessions.php