Unhandled Error!

Trying to get property of non-object

Document	Category
Document type	CMS page
Line	2
Exception class	Cms_ExecutionException

Code Highlight

<div id="cat-nav">
	<h1><?= $category->name;?></h1>
	<span>Shop by Category</span>
	<? $this->render_partial('shop:categories') ?>
</div>
<div id="cat-content">
	<? $this->render_partial('shop:breadcrumb');?>		
	<? if(!empty($category->description)):?>
	<div class="intro sub">
		<? //print_r($category);?>
		<img src="/themes/guildmaster/blocks/timthumb.php?src=<?= $category->image_url();?>&amp;h=292&amp;w=700&amp;zc=1" alt="<?= $category->description;?>" />
		<div class="desc">
			<?= $category->description;?>

#	Document	Type
1	Category	CMS page