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 ('4a7ac103e8193a1d7631d6a337f41966', -1, 1714041746, 1714041746, '12bc28cf', 3, 0, 0)

Line : 187
File : sessions.php