diff --git a/cyberwow/lib/controller/refresh.dart b/cyberwow/lib/controller/refresh.dart
index 98b1fd8..300e7d0 100644
--- a/cyberwow/lib/controller/refresh.dart
+++ b/cyberwow/lib/controller/refresh.dart
@@ -32,7 +32,7 @@ Stream<int> targetHeight(GetNotificationFunc getNotification) async* {
 
     if (_appState == AppLifecycleState.resumed) {
       final _targetHeight = await rpc.targetHeight();
-      yield _targetHeight
+      yield _targetHeight;
     }
 
     await Future.delayed(const Duration(seconds: 2), () => "1");
diff --git a/cyberwow/lib/state.dart b/cyberwow/lib/state.dart
index deee380..5106b01 100644
--- a/cyberwow/lib/state.dart
+++ b/cyberwow/lib/state.dart
@@ -178,17 +178,8 @@ class SyncedState extends HookedState {
   Future<ReSyncingState> next() async {
     print("Synced next");
 
-    while (true) {
-      final _appState = getNotification();
-      // print('synced: app state: ${_appState}');
-
-      if (_appState == AppLifecycleState.resumed) {
-        final _targetHeight = await rpc.targetHeight();
-        if (_targetHeight > 0) break;
-        height = await rpc.height();
-      }
-
-      await Future.delayed(const Duration(seconds: 2), () => "1");
+    await for (var _targetHeight in refresh.targetHeight(getNotification)) {
+      if (_targetHeight > 0) break;
     }
 
     // print('synced: loop exit');