diff --git a/tcpdf.php b/tcpdf.php
index 60f93c41..45b677b7 100644
--- a/tcpdf.php
+++ b/tcpdf.php
@@ -16440,7 +16440,7 @@ protected function getHtmlDomArray($html) {
 			)
 		);
 
-		if(empty($html)) {
+		if($html === '' || $html === null) {
 			return $dom;
 		}
 		// array of CSS styles ( selector => properties).