diff --git a/AsbCloudInfrastructure/AssemblyExtensions.cs b/AsbCloudInfrastructure/AssemblyExtensions.cs
index 9594261b..03cf7325 100644
--- a/AsbCloudInfrastructure/AssemblyExtensions.cs
+++ b/AsbCloudInfrastructure/AssemblyExtensions.cs
@@ -1,30 +1,50 @@
 using System;
-using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Reflection;
-using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 
 namespace AsbCloudInfrastructure
 {
-    public static class AssemblyExtensions
-    {
-        public static async Task<Stream> GetTemplateCopyStreamAsync(this Assembly assembly, string templateName, CancellationToken cancellationToken)
-        {
-            var resourceName = assembly
-                .GetManifestResourceNames()
-                .FirstOrDefault(n => n.EndsWith(templateName))!;
+	public static class AssemblyExtensions
+	{
+		public static Stream GetTemplateCopyStream(this Assembly assembly, string templateName)
+		{
+			var resourceName = assembly
+				.GetManifestResourceNames()
+				.FirstOrDefault(n => n.EndsWith(templateName));
 
-            using var stream = Assembly.GetExecutingAssembly()
-                .GetManifestResourceStream(resourceName)!;
+			if (string.IsNullOrWhiteSpace(resourceName))
+				throw new ArgumentNullException(nameof(resourceName));
 
-            var memoryStream = new MemoryStream();
-            await stream.CopyToAsync(memoryStream, cancellationToken);
-            memoryStream.Position = 0;
+			using var stream = Assembly.GetExecutingAssembly()
+				.GetManifestResourceStream(resourceName);
 
-            return memoryStream;
-        }
-    }
-}
+			var memoryStream = new MemoryStream();
+			stream?.CopyTo(memoryStream);
+			memoryStream.Position = 0;
+
+			return memoryStream;
+		}
+
+		[Obsolete]
+		public static async Task<Stream> GetTemplateCopyStreamAsync(this Assembly assembly,
+			string templateName,
+			CancellationToken cancellationToken)
+		{
+			var resourceName = assembly
+				.GetManifestResourceNames()
+				.FirstOrDefault(n => n.EndsWith(templateName))!;
+
+			using var stream = Assembly.GetExecutingAssembly()
+				.GetManifestResourceStream(resourceName)!;
+
+			var memoryStream = new MemoryStream();
+			await stream.CopyToAsync(memoryStream, cancellationToken);
+			memoryStream.Position = 0;
+
+			return memoryStream;
+		}
+	}
+}
\ No newline at end of file