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 ('6973492ee509e7dda9c9dc68ef0775e9', -1, 1711616583, 1711616583, '03eab177', -4, 0, 0)

Line : 187
File : sessions.php