diff --git a/lib/pages/account/account_devices_logic.dart b/lib/pages/account/account_devices_logic.dart
index cbc1241..f4776de 100644
--- a/lib/pages/account/account_devices_logic.dart
+++ b/lib/pages/account/account_devices_logic.dart
@@ -24,9 +24,7 @@ class AccountDevicesLogic extends ChangeNotifier {
     try {
       devices = await _repository.devices();
     } catch (failure) {
-      error = failure is ApiException
-          ? failure.message
-          : 'accountDevicesLoadFailed';
+      error = failure is ApiException ? failure.message : 'networkError';
     } finally {
       loading = false;
       _notify();
diff --git a/lib/pages/account/account_export_logic.dart b/lib/pages/account/account_export_logic.dart
index 90546a0..45864ec 100644
--- a/lib/pages/account/account_export_logic.dart
+++ b/lib/pages/account/account_export_logic.dart
@@ -25,9 +25,7 @@ class AccountExportLogic extends ChangeNotifier {
     try {
       data = await _repository.export();
     } catch (failure) {
-      error = failure is ApiException
-          ? failure.message
-          : 'accountExportLoadFailed';
+      error = failure is ApiException ? failure.message : 'networkError';
     } finally {
       loading = false;
       _notify();
diff --git a/lib/pages/account/account_profile_logic.dart b/lib/pages/account/account_profile_logic.dart
index 84292cc..53c9018 100644
--- a/lib/pages/account/account_profile_logic.dart
+++ b/lib/pages/account/account_profile_logic.dart
@@ -30,7 +30,7 @@ class AccountProfileLogic extends ChangeNotifier {
     try {
       profile = await _repository.profile();
     } catch (failure) {
-      error = _message(failure) ?? 'accountProfileLoadFailed';
+      error = _message(failure);
     } finally {
       loading = false;
       _notify();
@@ -68,7 +68,7 @@ class AccountProfileLogic extends ChangeNotifier {
       await onProfileUpdated(next);
       return true;
     } catch (failure) {
-      error = _message(failure) ?? 'accountProfileSaveFailed';
+      error = _message(failure);
       return false;
     } finally {
       saving = false;
@@ -76,8 +76,8 @@ class AccountProfileLogic extends ChangeNotifier {
     }
   }
 
-  String? _message(Object failure) =>
-      failure is ApiException ? failure.message : null;
+  String _message(Object failure) =>
+      failure is ApiException ? failure.message : 'networkError';
 
   void _notify() {
     if (!_disposed) notifyListeners();
diff --git a/test/account/account_pages_test.dart b/test/account/account_pages_test.dart
index b023326..90cc7d0 100644
--- a/test/account/account_pages_test.dart
+++ b/test/account/account_pages_test.dart
@@ -101,6 +101,83 @@ void main() {
 
     expect(find.byKey(const Key('account-export-content')), findsOneWidget);
   });
+
+  testWidgets('should_show_localized_network_copy_when_profile_load_fails', (
+    tester,
+  ) async {
+    final repository = FakeAccountRepository()..throwUnexpected = true;
+    final auth = await _signedInAuth();
+    await _pumpPage(
+      tester,
+      AccountProfilePage(),
+      repository: repository,
+      auth: auth,
+      locale: const Locale('zh'),
+    );
+    final l10n = await AppLocalizations.delegate.load(const Locale('zh'));
+
+    expect(find.text(l10n.networkError), findsOneWidget);
+    expect(find.text('accountProfileLoadFailed'), findsNothing);
+  });
+
+  testWidgets('should_show_localized_network_copy_when_profile_save_fails', (
+    tester,
+  ) async {
+    final repository = FakeAccountRepository();
+    final auth = await _signedInAuth();
+    await _pumpPage(
+      tester,
+      AccountProfilePage(),
+      repository: repository,
+      auth: auth,
+    );
+    repository.throwUnexpected = true;
+    await tester.enterText(
+      find.byKey(const Key('account-nickname')),
+      'Nadia Baru',
+    );
+    await tester.tap(find.byKey(const Key('account-profile-save')));
+    await tester.pumpAndSettle();
+    final l10n = await AppLocalizations.delegate.load(const Locale('en'));
+
+    expect(find.text(l10n.networkError), findsOneWidget);
+    expect(find.text('accountProfileSaveFailed'), findsNothing);
+  });
+
+  testWidgets('should_show_localized_network_copy_when_devices_fail', (
+    tester,
+  ) async {
+    final repository = FakeAccountRepository()..throwUnexpected = true;
+    final auth = await _signedInAuth();
+    await _pumpPage(
+      tester,
+      AccountDevicesPage(),
+      repository: repository,
+      auth: auth,
+      locale: const Locale('id'),
+    );
+    final l10n = await AppLocalizations.delegate.load(const Locale('id'));
+
+    expect(find.text(l10n.networkError), findsOneWidget);
+    expect(find.text('accountDevicesLoadFailed'), findsNothing);
+  });
+
+  testWidgets('should_show_localized_network_copy_when_export_fails', (
+    tester,
+  ) async {
+    final repository = FakeAccountRepository()..throwUnexpected = true;
+    final auth = await _signedInAuth();
+    await _pumpPage(
+      tester,
+      AccountExportPage(),
+      repository: repository,
+      auth: auth,
+    );
+    final l10n = await AppLocalizations.delegate.load(const Locale('en'));
+
+    expect(find.text(l10n.networkError), findsOneWidget);
+    expect(find.text('accountExportLoadFailed'), findsNothing);
+  });
 }
 
 Future<AuthController> _signedInAuth() async {
@@ -124,6 +201,7 @@ Future<void> _pumpPage(
   Widget page, {
   required FakeAccountRepository repository,
   required AuthController auth,
+  Locale locale = const Locale('en'),
 }) async {
   tester.view.physicalSize = const Size(390, 844);
   tester.view.devicePixelRatio = 1;
@@ -136,7 +214,7 @@ Future<void> _pumpPage(
         ChangeNotifierProvider<AuthController>.value(value: auth),
       ],
       child: MaterialApp(
-        locale: const Locale('en'),
+        locale: locale,
         supportedLocales: AppLocalizations.supportedLocales,
         localizationsDelegates: AppLocalizations.localizationsDelegates,
         home: Theme(data: ThemeData.dark(), child: page),
diff --git a/test/support/fake_account_repository.dart b/test/support/fake_account_repository.dart
index 039e0a3..2135a01 100644
--- a/test/support/fake_account_repository.dart
+++ b/test/support/fake_account_repository.dart
@@ -68,10 +68,12 @@ class FakeAccountRepository implements AccountRepository {
   bool failUpdate = false;
   bool failDeactivate = false;
   bool failCancel = false;
+  bool throwUnexpected = false;
 
   @override
   Future<AccountProfile> profile() async {
     profileCalls++;
+    if (throwUnexpected) throw StateError('offline');
     if (failProfile) throw const ApiException(500, '资料加载失败');
     return _profile;
   }
@@ -79,6 +81,7 @@ class FakeAccountRepository implements AccountRepository {
   @override
   Future<AccountProfile> updateProfile(AccountProfileUpdate update) async {
     lastUpdate = update;
+    if (throwUnexpected) throw StateError('offline');
     if (failUpdate) throw const ApiException(400, '昵称不可用');
     _profile = AccountProfile(
       uid: _profile.uid,
@@ -100,6 +103,7 @@ class FakeAccountRepository implements AccountRepository {
   @override
   Future<List<AccountDevice>> devices() async {
     deviceCalls++;
+    if (throwUnexpected) throw StateError('offline');
     if (failDevices) throw const ApiException(500, '设备加载失败');
     return [..._devices];
   }
@@ -107,6 +111,7 @@ class FakeAccountRepository implements AccountRepository {
   @override
   Future<AccountExport> export() async {
     exportCalls++;
+    if (throwUnexpected) throw StateError('offline');
     if (failExport) throw const ApiException(500, '导出失败');
     return _export;
   }