diff --git a/src/Option/Parser/Select.php b/src/Option/Parser/Select.php
index 977627f..60c0b3c 100644
--- a/src/Option/Parser/Select.php
+++ b/src/Option/Parser/Select.php
@@ -44,15 +44,18 @@ class Select extends Base
         /** @var PaperContainer\Container $container */
         $container = $this->getPaperContainer()->getContainerById((string)$this->node['container']);
 
-        /** @var PaperContainer\Item $papier */
-        foreach ($container->getItems() as $papier) {
-            /** @var Paper $papierDb */
-            $papierDb = $this->getPaperRepository()->findOneBy(array('artNr' => $papier->getId()));
-            if($papierDb) {
-                $optPapier = new \PSC\Library\Calc\Option\Type\Select\Opt();
-                $optPapier->setId($papierDb->getArtNr());
-                $optPapier->setLabel($papierDb->getDescription1());
-                $this->element->addOption($optPapier);
+        if($container) {
+            /** @var PaperContainer\Item $papier */
+            
+            foreach ($container->getItems() as $papier) {
+                /** @var Paper $papierDb */
+                $papierDb = $this->getPaperRepository()->findOneBy(array('artNr' => $papier->getId()));
+                if($papierDb) {
+                    $optPapier = new \PSC\Library\Calc\Option\Type\Select\Opt();
+                    $optPapier->setId($papierDb->getArtNr());
+                    $optPapier->setLabel($papierDb->getDescription1());
+                    $this->element->addOption($optPapier);
+                }
             }
         }
     }