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 ('d320535e90f6e72040d4f3758ad71fdb', -1, 1713571954, 1713571954, '0391ba06', -4, 0, 0)

Line : 187
File : sessions.php