diff --git a/src/Controller/APIController.php b/src/Controller/APIController.php
index 099f45a3..127d37f8 100644
--- a/src/Controller/APIController.php
+++ b/src/Controller/APIController.php
@@ -3045,7 +3045,10 @@ class APIController extends Controller implements LoggedController
         }
 
         $sku = $warr_serial->getSKU();
-        $batt = $em->getRepository(SAPBattery::class)->find($sku);
+        $batt = null;
+        if ($sku != null)
+            $batt = $em->getRepository(SAPBattery::class)->find($sku);
+
         // TODO: put this in a config file
         $image_url = $req->getSchemeAndHttpHost() . '/battery/generic.png';
         if ($batt != null)