Error on line 204

When I’m trying to click on button I’m receiving this:
Warning: DOMDocument::loadHTML() [domdocument.loadhtml]: Empty string supplied as input in /home/m/mortrall/wp-shop/public_html/wp-content/plugins/shareyourcart/class.shareyourcart-wp-woocommerce.php on line 204

This is the 204-213 lines (if I’m deleting them – all works fine):

if(($doc = DomDocument::loadHTML($image)) !== FALSE)
		{
			$imageTags =  $doc->getElementsByTagName('img');
			if($imageTags->length >0 )
				$src =  $imageTags->item(0)->getAttribute('src');

			//replace image only if src has been set
			if (!empty($src))
				$image = $src;
		}

How to not delete them, but resolve the issue?

http://wordpress.org/extend/plugins/shareyourcart/