Unhandled Error!

Trying to get property of non-object

Document	breadcrumbs
Document type	CMS partial
Line	16
Exception class	Cms_ExecutionException

Code Highlight

				</li>
				<?
					if ($dresscode_page_url):
						$p = Shop_Category::find_by_url($dresscode_page_url, $params);
				?>
					<li itemscope itemtype="http://data-vocabulary.org/Breadcrumb">
						 › <a href="<?= site_url($p->url_name) ?>" itemprop="url" title="<?= h($p->title) ?>">
							<span itemprop="title"><?= h($p->name) ?></span>
						</a>
					</li>
				<? endif ?>
				<?
					if ($dresscode_category_url && !is_numeric($dresscode_category_url)):

#	Document	Type
2	breadcrumbs	CMS partial
1	shop:catalog	CMS template