phpBB : Critical Error

Error creating new session

DEBUG MODE

SQL Error : 1062 Duplicate entry '-1' for key 'BP_sessions.session_user_id'

INSERT INTO BP_sessions (session_id, session_user_id, session_start, session_time, session_ip, session_page, session_logged_in, session_admin) VALUES ('6a2fea945a1a5b1d32f1d548b4d8fe3b', -1, 1762892905, 1762892905, '126109ab', -8, 0, 0)

Line : 193
File : sessions.php