Cannot Get Brand To Display On Product Contact Page

<?php
		if($this->config->get('manufacturer_display', 0) && !empty($this->element->product_manufacturer_id)){
			$class = hikashop_get('class.category');
			$manufacturer = $class->get($this->element->product_manufacturer_id, true);
			global $Itemid;
			$categoryClass = hikashop_get('class.category');
			$categoryClass->addAlias($manufacturer);
			echo $this->image->display($manufacturer->file_path,false,$manufacturer->file_name, '', '', $this->image->main_thumbnail_x, $this->image->main_thumbnail_y);
		}
		?>

<?php
$db = JFactory::getDBO();
$db->setQuery('SELECT category_name FROM '.hikashop_table('category').' WHERE category_id='.(int)$this->row->product_manufacturer_id);
$brandName = $db->loadResult();
echo $brandName;
		}
		?>

<p class="hikashop_cart_brand_name">
	<?php $class = hikashop_get('class.category');
	$manufacturer = $class->get($product->product_manufacturer_id);
	echo $manufacturer->category_name; ?>
</p>