phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'session_user_id'

INSERT INTO phpbb_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('ee6b25a2299c2bd0fc53ee9ca529c3bd', -1, 1638408538, 1638408538, '36eabfca', 26, 0, 0)

Line : 187
File : sessions.php