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 ('8b799d8f0d798942d7a91056c0bda2cc', -1, 1711695351, 1711695351, '22efb916', -4, 0, 0)

Line : 187
File : sessions.php