phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'da6d4c91458c8884b9ef3fc88e66cc68' 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 ('da6d4c91458c8884b9ef3fc88e66cc68', -1, 1771718265, 1771718265, 'd849d882', -4, 0, 0)

Line : 187
File : sessions.php