diff --git a/Classes/ExpressionLanguage/DocumentTypeFunctionProvider.php b/Classes/ExpressionLanguage/DocumentTypeFunctionProvider.php
index 7b44e32e8..1c3a5f62d 100644
--- a/Classes/ExpressionLanguage/DocumentTypeFunctionProvider.php
+++ b/Classes/ExpressionLanguage/DocumentTypeFunctionProvider.php
@@ -137,6 +137,11 @@ function($arguments, $cPid)
                     return 'object';
                 }
 
+                // It happens that $queryParams does not contain a key 'tx_dlf[id]'
+                if (!isset($queryParams['tx_dlf']['id'])) {
+                    return $type;
+                }
+
                 // Load document with current plugin parameters.
                 $this->loadDocument($queryParams['tx_dlf'], $cPid);
                 if (!isset($this->document) || $this->document->getCurrentDocument() === null) {