diff --git a/classes/controller/AdminController.php b/classes/controller/AdminController.php
index 7d231519e..37a5632ff 100644
--- a/classes/controller/AdminController.php
+++ b/classes/controller/AdminController.php
@@ -111,7 +111,7 @@ class AdminControllerCore extends Controller
 	protected $fields_form_override;
 
 	/** @var array list of option forms to be generated */
-	protected $fields_options;
+	protected $fields_options = array();
 
 	protected $shopLink;