diff --git a/src/voku/helper/AbstractSimpleHtmlDom.php b/src/voku/helper/AbstractSimpleHtmlDom.php
index fdc68a4..69cd664 100644
--- a/src/voku/helper/AbstractSimpleHtmlDom.php
+++ b/src/voku/helper/AbstractSimpleHtmlDom.php
@@ -180,7 +180,9 @@ public function __set($name, $value)
                         $value = (string)$value;
                     }
 
-                    return $this->node->{$nameOrig} = $value;
+                    if (!is_null($value)) {
+                        return $this->node->{$nameOrig} = $value;
+                    }
                 }
 
                 return $this->setAttribute($name, $value);