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 ('84cc65202a6ed1adb68477289dc4e496', -1, 1713891847, 1713891847, '12e095f2', -4, 0, 0)

Line : 187
File : sessions.php