[BUGFIX] Document type switch throws error if no document is set (kit…

…odo#1310)

Co-authored-by: Bernd Fallert <[email protected]>

Classes/ExpressionLanguage/DocumentTypeFunctionProvider.php

@@ -73,7 +73,7 @@ public function injectConfigurationManager(ConfigurationManager $configurationMa
      * @var DocumentRepository
      */
     protected $documentRepository;
-    
+
     /**
      * @param DocumentRepository $documentRepository
      */
@@ -134,6 +134,11 @@ function($arguments, $cPid)
                     return $type;
                 }
 
+                // 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'], $cPid);
                 if ($this->document === null || $this->document->getCurrentDocument() === null) {