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 ('6c7af739f3d9be3d82904aa2028ba0cb', -1, 1730416178, 1730416178, '030e868b', -1280, 0, 0)

Line : 195
File : sessions.php