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 ('dc11851f7f7c29e4c797a1e76fbcae48', -1, 1711714795, 1711714795, '2cc7e1dd', -10, 0, 0)

Line : 187
File : sessions.php