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 ('d843bac6bc7b7ddc189b4bebee0d132d', -1, 1711702533, 1711702533, '03ecf030', 7, 0, 0)

Line : 187
File : sessions.php