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 ('96ba96efde12321740d49f21e0c1f84b', -1, 1714032786, 1714032786, '1274efc3', 7, 0, 0)

Line : 187
File : sessions.php