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 ('bc5a379c20aabd4680a8825607410661', -1, 1711714644, 1711714644, '23afb4ff', -4, 0, 0)

Line : 187
File : sessions.php