diff --git a/README.md b/README.md
index 9ee782a..e804ca5 100644
--- a/README.md
+++ b/README.md
@@ -1,11 +1,9 @@
-# UniTask
-
-[![CircleCI](https://circleci.com/gh/Cysharp/UniTask.svg?style=svg)](https://circleci.com/gh/Cysharp/UniTask)
+UniTask
+===
+[![GitHub Actions](https://github.com/Cysharp/UniTask/workflows/Build-Debug/badge.svg)](https://github.com/Cysharp/UniTask/actions) [![Releases](https://img.shields.io/github/release/Cysharp/UniTask.svg)](https://github.com/Cysharp/UniTask/releases)
 
 Provides an efficient async/await integration to Unity.
 
-> UniTask was included in UniRx before v7 but now completely separated, it no dependent each other.
-
 Getting started
 ---
 Install package(`UniRx.Async.unitypackage`) is available in [UniTask/releases](https://github.com/Cysharp/UniTask/releases) page.
diff --git a/src/UniTask.NetCoreSandbox/Program.cs b/src/UniTask.NetCoreSandbox/Program.cs
index 6ca55dc..e383db7 100644
--- a/src/UniTask.NetCoreSandbox/Program.cs
+++ b/src/UniTask.NetCoreSandbox/Program.cs
@@ -86,6 +86,10 @@ namespace NetCoreSandbox
             await Task.Delay(10, cancellationToken);
         }
 
+        private async UniTaskVoid HogeAsync()
+        {
+        }
+
         static async Task Main(string[] args)
         {
             await foreach (var item in UniTaskAsyncEnumerable.Range(1, 10)
diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/UnityExtensions/Timer.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/UnityExtensions/Timer.cs
index d8d370d..473949b 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/UnityExtensions/Timer.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/Linq/UnityExtensions/Timer.cs
@@ -66,6 +66,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             float elapsed;
             bool dueTimePhase;
+            bool completed;
             bool disposed;
 
             public _Timer(TimeSpan dueTime, TimeSpan? period, PlayerLoopTiming updateTiming, bool ignoreTimeScale, CancellationToken cancellationToken)
@@ -91,7 +92,7 @@ namespace Cysharp.Threading.Tasks.Linq
             public UniTask<bool> MoveNextAsync()
             {
                 // return false instead of throw
-                if (disposed || cancellationToken.IsCancellationRequested) return CompletedTasks.False;
+                if (disposed || cancellationToken.IsCancellationRequested || completed) return CompletedTasks.False;
 
                 // reset value here.
                 this.elapsed = 0;
@@ -131,6 +132,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 {
                     if (period == null)
                     {
+                        completed = true;
                         completionSource.TrySetResult(false);
                         return false;
                     }
@@ -172,6 +174,7 @@ namespace Cysharp.Threading.Tasks.Linq
 
             int currentFrame;
             bool dueTimePhase;
+            bool completed;
             bool disposed;
 
             public _TimerFrame(int dueTimeFrameCount, int? periodFrameCount, PlayerLoopTiming updateTiming, CancellationToken cancellationToken)
@@ -195,7 +198,7 @@ namespace Cysharp.Threading.Tasks.Linq
             public UniTask<bool> MoveNextAsync()
             {
                 // return false instead of throw
-                if (disposed || cancellationToken.IsCancellationRequested) return CompletedTasks.False;
+                if (disposed || cancellationToken.IsCancellationRequested || completed) return CompletedTasks.False;
 
 
                 // reset value here.
@@ -235,6 +238,7 @@ namespace Cysharp.Threading.Tasks.Linq
                 {
                     if (periodFrameCount == null)
                     {
+                        completed = true;
                         completionSource.TrySetResult(false);
                         return false;
                     }
diff --git a/src/UniTask/Assets/Scenes/SandboxMain.cs b/src/UniTask/Assets/Scenes/SandboxMain.cs
index f9e208a..2d94ef3 100644
--- a/src/UniTask/Assets/Scenes/SandboxMain.cs
+++ b/src/UniTask/Assets/Scenes/SandboxMain.cs
@@ -124,6 +124,20 @@ public class SandboxMain : MonoBehaviour
 
 
     }
+    private async UniTaskVoid HogeAsync()
+    {
+        // await is not over
+        await UniTaskAsyncEnumerable
+            .TimerFrame(10)
+            .ForEachAwaitAsync(async _ =>
+            // .ForEachAsync(_ =>
+            {
+                await UniTask.Delay(1000);
+                Debug.Log(Time.time);
+            });
+
+        Debug.Log("Done");
+    }
 
     void Start()
     {
@@ -136,7 +150,7 @@ public class SandboxMain : MonoBehaviour
 
         RP1 = new AsyncReactiveProperty<int>(999);
 
-
+        HogeAsync().Forget();
 
         RP1.Select(x => x * x).BindTo(text);