diff --git a/app/controller/api/server/Store.php b/app/controller/api/server/Store.php
index aae4ea4e..c5e81eac 100644
--- a/app/controller/api/server/Store.php
+++ b/app/controller/api/server/Store.php
@@ -145,7 +145,7 @@ class Store extends BaseController
             'spring_subsidy' => $saleTarget,
             'spring_subsidy_amount' => $merchant['purchase_amount'],
             'spring_subsidy_rate' => $springSubsidyRate,
-            'balance' => $merchant['balance'],
+            'balance' => $merchant['balance'] ?? '0.00',
         ]);
     }