diff --git a/typo3/sysext/backend/Classes/Form/Element/UnknownElement.php b/typo3/sysext/backend/Classes/Form/Element/UnknownElement.php
index 69e63543381e04636353cb071ce0d0404824d5e1..3f53ff707efb68a03aa2505372a93dbe4729fe0a 100644
--- a/typo3/sysext/backend/Classes/Form/Element/UnknownElement.php
+++ b/typo3/sysext/backend/Classes/Form/Element/UnknownElement.php
@@ -27,8 +27,9 @@ class UnknownElement extends AbstractFormElement
     public function render()
     {
         $type = $this->data['parameterArray']['fieldConf']['config']['type'];
+        $renderType = $this->data['renderType'];
         $resultArray = $this->initializeResultArray();
-        $resultArray['html'] = 'Unknown type: ' . $type . '<br />';
+        $resultArray['html'] = 'Unknown type: ' . $type . ($renderType ? ', render type: ' . $renderType : '') . '<br />';
         return $resultArray;
     }
 }