diff --git a/library/Businessprocess/Storage/LegacyConfigRenderer.php b/library/Businessprocess/Storage/LegacyConfigRenderer.php
index 430a7a5..1f7e23b 100644
--- a/library/Businessprocess/Storage/LegacyConfigRenderer.php
+++ b/library/Businessprocess/Storage/LegacyConfigRenderer.php
@@ -11,6 +11,8 @@ class LegacyConfigRenderer
     /** @var array */
     protected $renderedNodes;
 
+    protected $config;
+
     /**
      * LecagyConfigRenderer constructor
      *