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 ('b2d131b26dd1a648fee99da3faebf6ca', -1, 1711633517, 1711633517, '035b0817', -4, 0, 0)

Line : 187
File : sessions.php