Unhandled Error!

Trying to get property of non-object

Document	Product
Document type	CMS page
Line	3
Exception class	Cms_ExecutionException

Code Highlight

<div id="alpha">
  	<? //$this->render_partial('shop:bag_builder') ?>
	<? $this->render_partial('shop:categories', array('category_url_name', $product->category_list[0]->category_url_name)) ?>
	<? //$this->render_partial('shop:product_reviews') ?>
	<? //$this->render_partial('shop:product_rating_info') ?>
	<? $this->render_partial('pxevent:registered_players') ?>
	<? $this->render_partial('shop:related_products') ?>
	<? $this->render_partial('ssl_seal') ?>
</div>
<div id="beta">
	<div class="bucket">
		<h2><?=(!$product)?'Unknown':$product->name?></h2>
		<div class="content">

#	Document	Type
1	Product	CMS page