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 ('1f91077276bb1fd42c9928d0234f1736', -1, 1714011446, 1714011446, '340e16fa', -4, 0, 0)

Line : 187
File : sessions.php