diff --git a/src/Controller/APIController.php b/src/Controller/APIController.php
index 4a0e6831..f9696561 100644
--- a/src/Controller/APIController.php
+++ b/src/Controller/APIController.php
@@ -803,8 +803,8 @@ class APIController extends Controller
         {
             $items_data[] = [
                 'title' => $item->getTitle(),
-                'qty' => $item->getQuantity(),
-                'price' => $item->getPrice(),
+                'qty' => $item->getQuantity() + 0,
+                'price' => $item->getPrice() + 0.0,
             ];
         }
         $invoice_data['items'] = $items_data;
@@ -911,8 +911,8 @@ class APIController extends Controller
         {
             $items_data[] = [
                 'title' => $item->getTitle(),
-                'qty' => $item->getQuantity(),
-                'price' => $item->getPrice(),
+                'qty' => $item->getQuantity() + 0,
+                'price' => $item->getPrice() + 0.0,
             ];
         }