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 ('1f4286e7c07f97e98d1ee2cb28bedf4c', -1, 1709187960, 1709187960, '03ecdf6a', 0, 0, 0)

Line : 187
File : sessions.php