Os seguintes erros Aconteceram:

Erro na execução da query SELECT * FROM categorias WHERE cat_id = LIMIT 1
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 'LIMIT 1' at line 1

Detalhes:

Arquivo -> /home/unidosin/public_html/app/system/classes/database/drivers/DB_Mysqli.php

Linha -> 62

#0 CError::System(Erro na execução da query SELECT * FROM categorias WHERE cat_id = LIMIT 1
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 'LIMIT 1' at line 1) called at [/home/unidosin/public_html/app/system/classes/database/drivers/DB_Mysqli.php:62]
#1 CDb_DB_Mysqli->Query(SELECT * FROM categorias WHERE cat_id = LIMIT 1) called at [/home/unidosin/public_html/app/system/classes/framework/model.php:155]
#2 CModel->readReg(cat_id = , categorias) called at [/home/unidosin/public_html/includes/modulos/mod_produtos/site.php:136]
#3 CProdutos_Controller->_naveg(, ) called at [/home/unidosin/public_html/includes/modulos/mod_produtos/site.php:65]
#4 CProdutos_Controller->_Listar() called at [/home/unidosin/public_html/app/system/classes/framework/controller.php:80]
#5 CController->_execute() called at [/home/unidosin/public_html/app/system/classes/aplication/site.php:74]
#6 CSite->Inicializar() called at [/home/unidosin/public_html/index.php:24]