Unhandled Error!

Trying to get property of non-object

Document	snippet:blog_banner
Document type	CMS partial
Line	5
Exception class	Cms_ExecutionException

Code Highlight

<section class="snippet hero maroon service contact text-center-sm">
	<div class="container">
		<div class="row">
			<div class="col-md-8">
				<h1 style="font-size:36px;"><?= $post->title; ?></h1>
				<h3><?= $this->page->sub_title ?></h3>
			</div>
			<? $this->render_partial('site:header_contact'); ?>
		</div>
	</div>
</section>

#	Document	Type
2	snippet:blog_banner	CMS partial
1	Blog Post	CMS page