diff --git a/src/UniTask/Assets/Plugins/UniTask/Runtime/TimeoutController.cs b/src/UniTask/Assets/Plugins/UniTask/Runtime/TimeoutController.cs
index 63782a9..faca347 100644
--- a/src/UniTask/Assets/Plugins/UniTask/Runtime/TimeoutController.cs
+++ b/src/UniTask/Assets/Plugins/UniTask/Runtime/TimeoutController.cs
@@ -99,7 +99,7 @@ namespace Cysharp.Threading.Tasks
 
         public void Reset()
         {
-            timer.Stop();
+            timer?.Stop();
         }
 
         public void Dispose()