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 ('88ad00b075b60fe801dce4f7d47b1480', -1, 1730467641, 1730467641, '12e1d198', -1, 0, 0)

Line : 195
File : sessions.php