Unhandled Error!

Trying to get property of non-object

Document shop:nav:category:filters
Document type CMS partial
Line 2
Exception class Cms_ExecutionException

Code Highlight

<?
 $product_filters = Cms_VisitorPreferences::get('category_'.$category->id.'_product_filters', array());
?>
 
<?= open_form(array('id'=>'product-filters','class'=>'clearfix well')) ?>
 
 
	<?php 
		if($category->parent): 
	?>
 
	<ul>
		<?php foreach($category->parent->list_children() as $cat): ?>
# Document Type
2 shop:nav:category:filters CMS partial
1 Left sidebar CMS template