phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '4cff9e948acd13500d94e281e89cc7c5' for key 'PRIMARY'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in) VALUES ('4cff9e948acd13500d94e281e89cc7c5', -1, 1771027455, 1771027455, 'd849d87b', -9, 0)

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