diff --git a/tcpdf.php b/tcpdf.php
index cd020512..f9a48cb8 100644
--- a/tcpdf.php
+++ b/tcpdf.php
@@ -16389,6 +16389,8 @@ public function getHTMLFontUnits($val, $refsize=12, $parent_size=12, $defaultuni
 	 * @since 3.2.000 (2008-06-20)
 	 */
 	protected function getHtmlDomArray($html) {
+		if(empty($html))
+			return array(); 
 		// array of CSS styles ( selector => properties).
 		$css = array();
 		// get CSS array defined at previous call