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 ('d4ba23cca8d9fcdbdbba539cc3cc44f2', -1, 1634979436, 1634979436, '23acd9ae', 40, 0, 0)

Line : 187
File : sessions.php