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 ('b6a0caef5f9dd77e0e664bcf3fe7a8f2', -1, 1714037391, 1714037391, '0316b5d1', -4, 0, 0)

Line : 187
File : sessions.php