phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '704470f431a7772d13288aa68de8c214' 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 ('704470f431a7772d13288aa68de8c214', -1, 1771024871, 1771024871, 'd849d88a', -4, 0, 0)

Line : 187
File : sessions.php