PHP Fatal Error version 3.9.2 & PHP 8.0

Hello

Your plugin is crashing my site;

Fatal error: Uncaught ValueError: DOMDocument::loadHTML(): Argument #1 ($source) must not be empty in wp-content/plugins/easy-testimonials/include/lib/gp-testimonial.class.php:951

It eappears to refer to:

$doc = new DOMDocument();

        $doc->loadHTML($html);
		$image_tags = $doc->getElementsByTagName('img');
		if ( empty($image_tags) ) {
			return '';
		}