phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry 'c78a83e79a6278f7793f9980a9504171' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('c78a83e79a6278f7793f9980a9504171', -1, 1771442753, 1771442753, 'd849d87b', -9, 0)

Line : 180
File : /www/includes/sessions.php