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 ('bcf5757df2100219246831cb5e248495', -1, 1762570763, 1762570763, '12610e55', -11, 0, 0)

Line : 193
File : sessions.php