Fatal error: Uncaught exception 'Exception' with message 'Error: Unknown column '6PPD' in 'where clause'<br />Error No: 1054<br />SELECT * FROM cp_category c INNER JOIN cp_category_description cd ON c.category_id = cd.category_id WHERE cd.language_id = 2 AND c.category_id = (SELECT category_id FROM cp_product_to_category WHERE product_id = 6PPD AND main_category = 1 LIMIT 1)' in C:\xampp\htdocs\system\library\db\mysqli.php:40 Stack trace: #0 C:\xampp\htdocs\system\library\db.php(16): DB\MySQLi->query('SELECT * FROM c...', Array) #1 C:\xampp\htdocs\catalog\model\catalog\product.php(427): DB->query('SELECT * FROM c...') #2 [internal function]: ModelCatalogProduct->getMainCategory('6PPD') #3 C:\xampp\htdocs\system\engine\loader.php(150): call_user_func_array(Array, Array) #4 [internal function]: Loader->{closure}(Array) #5 C:\xampp\htdocs\system\engine\proxy.php(13): call_user_func(Object(Closure), Array) #6 C:\xampp\htdocs\catalog\controller\product\product.php(19): Proxy->__call('getMainCategory', Array) #7 C:\xampp\htdocs in C:\xampp\htdocs\system\library\db\mysqli.php on line 40