diff --git a/frontend/admin-app/lib/core/services/issuer_coupon_service.dart b/frontend/admin-app/lib/core/services/issuer_coupon_service.dart
index 9c03bb2..9791a6b 100644
--- a/frontend/admin-app/lib/core/services/issuer_coupon_service.dart
+++ b/frontend/admin-app/lib/core/services/issuer_coupon_service.dart
@@ -30,7 +30,7 @@ class IssuerCouponService {
               ?.map((e) => IssuerCouponModel.fromJson(e as Map<String, dynamic>))
               .toList() ??
           [];
-      return (items: items, total: inner['total'] ?? items.length);
+      return (items: items, total: (inner['total'] as int?) ?? items.length);
     } catch (e) {
       debugPrint('[IssuerCouponService] list 失败: $e');
       rethrow;
diff --git a/frontend/admin-app/lib/core/services/issuer_finance_service.dart b/frontend/admin-app/lib/core/services/issuer_finance_service.dart
index 1e10370..a6fc87c 100644
--- a/frontend/admin-app/lib/core/services/issuer_finance_service.dart
+++ b/frontend/admin-app/lib/core/services/issuer_finance_service.dart
@@ -54,7 +54,7 @@ class IssuerFinanceService {
               ?.map((e) => TransactionModel.fromJson(e as Map<String, dynamic>))
               .toList() ??
           [];
-      return (items: items, total: inner['total'] ?? items.length);
+      return (items: items, total: (inner['total'] as int?) ?? items.length);
     } catch (e) {
       debugPrint('[IssuerFinanceService] getTransactions 失败: $e');
       rethrow;
diff --git a/frontend/admin-app/lib/core/services/redemption_service.dart b/frontend/admin-app/lib/core/services/redemption_service.dart
index 41a4fcb..ad30c90 100644
--- a/frontend/admin-app/lib/core/services/redemption_service.dart
+++ b/frontend/admin-app/lib/core/services/redemption_service.dart
@@ -75,7 +75,7 @@ class RedemptionService {
               ?.map((e) => RedemptionRecord.fromJson(e as Map<String, dynamic>))
               .toList() ??
           [];
-      return (items: items, total: inner['total'] ?? items.length);
+      return (items: items, total: (inner['total'] as int?) ?? items.length);
     } catch (e) {
       debugPrint('[RedemptionService] getHistory 失败: $e');
       rethrow;
diff --git a/frontend/admin-app/lib/features/credit/presentation/pages/credit_page.dart b/frontend/admin-app/lib/features/credit/presentation/pages/credit_page.dart
index 158e7f3..aa10a5d 100644
--- a/frontend/admin-app/lib/features/credit/presentation/pages/credit_page.dart
+++ b/frontend/admin-app/lib/features/credit/presentation/pages/credit_page.dart
@@ -191,8 +191,8 @@ class _CreditPageState extends State<CreditPage> {
             );
           }),
           if (factors.isEmpty)
-            const Padding(
-              padding: EdgeInsets.all(16),
+            Padding(
+              padding: const EdgeInsets.all(16),
               child: Center(child: Text(context.t('credit_no_factors'), style: const TextStyle(color: AppColors.textTertiary))),
             ),
         ],