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 ('48a987b77c04e74cfa94e3f13d7bbd67', -1, 1708822901, 1708822901, '23afc9bf', -4, 0, 0)

Line : 187
File : sessions.php