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 ('b4fcc20ffec0a8d1c4955f75173c2cd2', -1, 1711720030, 1711720030, '035b2b16', -4, 0, 0)

Line : 187
File : sessions.php