diff --git a/system/src/Grav/Common/Data/Blueprint.php b/system/src/Grav/Common/Data/Blueprint.php
index 4eb2f8061..3394dbf1c 100644
--- a/system/src/Grav/Common/Data/Blueprint.php
+++ b/system/src/Grav/Common/Data/Blueprint.php
@@ -14,6 +14,9 @@ class Blueprint
     use Export;
 
     public $name;
+
+    public $initialized = false;
+
     protected $items;
     protected $context;
     protected $fields;