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 ('b19605641351d2a882362cf922db3dd0', -1, 1713464494, 1713464494, '0389dc78', -4, 0, 0)

Line : 187
File : sessions.php