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 ('d47c4b2a5dd3ebd9f1170f4caab62406', -1, 1711701375, 1711701375, '03eb780f', -4, 0, 0)

Line : 187
File : sessions.php