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 ('a7a0f38b717e7e4b0c3f620f388289d5', -1, 1713567191, 1713567191, '340e0822', -8, 0, 0)

Line : 187
File : sessions.php