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 ('91a5657a16d8ac510b2b5044b4e7572e', -1, 1713628133, 1713628133, '12bfea3e', 2, 0, 0)

Line : 187
File : sessions.php