diff --git a/src/Controller/APIController.php b/src/Controller/APIController.php
index d7b2a8fd..b2aabd5b 100644
--- a/src/Controller/APIController.php
+++ b/src/Controller/APIController.php
@@ -2936,7 +2936,11 @@ class APIController extends Controller implements LoggedController
                 break;
         }
 
-        $icrit->addEntry($batt, $trade_in, 1);
+        // right now, the app does not include trade-ins but this might change in the future
+        if (empty($trade_in))
+            $icrit->addEntry($batt, null, 1);
+        else
+            $icrit->addEntry($batt, $trade_in, 1);
 
         // send to invoice generator
         $invoice = $ic->generateInvoice($icrit);