diff --git a/Scripts/Service/Unity/UnityHttpRequest.cs b/Scripts/Service/Unity/UnityHttpRequest.cs
index e0a4e20..cf55743 100644
--- a/Scripts/Service/Unity/UnityHttpRequest.cs
+++ b/Scripts/Service/Unity/UnityHttpRequest.cs
@@ -126,7 +126,7 @@ private void UpdateProgress(ref float currentProgress, float progress, Action<fl
 			if (currentProgress < progress)
 			{
 				currentProgress = progress;
-				onProgress(downloadProgress);
+				onProgress?.Invoke(currentProgress);
 			}
 		}
 	}