Ocorreu um erro e não é relacionado com banco de dados

Error Number: 1064

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1

SELECT id, nome, arquivo, descricao, folder FROM ci_usuarios WHERE id =

Filename: /home/potiguarnoticias/public_html/controllers/site/colunas.php

Line Number: 121