diff --git a/bundles/EcommerceFrameworkBundle/Model/DefaultMockup.php b/bundles/EcommerceFrameworkBundle/Model/DefaultMockup.php
index 61e28ef4653..0f8218c1d1c 100644
--- a/bundles/EcommerceFrameworkBundle/Model/DefaultMockup.php
+++ b/bundles/EcommerceFrameworkBundle/Model/DefaultMockup.php
@@ -73,7 +73,7 @@ public function getParams()
      */
     public function getParam($key)
     {
-        return $this->params[$key];
+        return $this->params[$key] ?? null;
     }
 
     /**