diff --git a/.gitignore b/.gitignore
index 645dda5..73079a1 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 ._*
 *~
 *.kpf
+/nbproject/private/
\ No newline at end of file
diff --git a/modules/order/src/Form/OrderForm.php b/modules/order/src/Form/OrderForm.php
index 719ed12..3655b86 100644
--- a/modules/order/src/Form/OrderForm.php
+++ b/modules/order/src/Form/OrderForm.php
@@ -86,7 +86,7 @@ class OrderForm extends ContentEntityForm {
         '#tag' => 'h3',
         '#value' => $order->getState()->getLabel(),
         '#attributes' => [
-          'class' => 'entity-meta__title',
+          'class' => ['entity-meta__title'],
         ],
         // Hide the rendered state if there's a widget for it.
         '#access' => empty($form['store_id']),