diff --git a/package.props b/package.props
index 68a4d3e7..4998542c 100644
--- a/package.props
+++ b/package.props
@@ -4,8 +4,8 @@
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
     <PackageRequireLicenseAcceptance>true</PackageRequireLicenseAcceptance>
     <PackageLicenseFile>LICENSE.txt</PackageLicenseFile>
-    <Version>5.0.0-beta3</Version>
-    <FileVersion>5.0.0.1</FileVersion>
+    <Version>5.0.0-beta4</Version>
+    <FileVersion>5.0.0.4</FileVersion>
     <Authors>zlzforever@163.com;</Authors>
     <Copyright>Copyright 2018 Lewis Zou</Copyright>
     <Description>DotnetSpider, a .NET Standard web crawling library. It is lightweight, efficient and fast high-level web crawling &amp; scraping framework</Description>
diff --git a/src/DotnetSpider.Portal/Controllers/API/SpiderController.cs b/src/DotnetSpider.Portal/Controllers/API/SpiderController.cs
index 802d8550..99b6d639 100644
--- a/src/DotnetSpider.Portal/Controllers/API/SpiderController.cs
+++ b/src/DotnetSpider.Portal/Controllers/API/SpiderController.cs
@@ -234,6 +234,11 @@ namespace DotnetSpider.Portal.Controllers.API
 				.ToDictionaryAsync(x => x.Id, x => x);
 			foreach (var item in @out.Data)
 			{
+				if (!dict.ContainsKey(item.Batch))
+				{
+					continue;
+				}
+
 				var statistics = dict[item.Batch];
 				if (statistics != null)
 				{
diff --git a/src/DotnetSpider.Sample/samples/EntitySpider.cs b/src/DotnetSpider.Sample/samples/EntitySpider.cs
index f64512ea..40b171e2 100644
--- a/src/DotnetSpider.Sample/samples/EntitySpider.cs
+++ b/src/DotnetSpider.Sample/samples/EntitySpider.cs
@@ -13,6 +13,7 @@ using Microsoft.Extensions.Hosting;
 using Microsoft.Extensions.Logging;
 using Microsoft.Extensions.Options;
 using Serilog;
+using SwiftMQ.DependencyInjection;
 
 namespace DotnetSpider.Sample.samples
 {
diff --git a/src/DotnetSpider/Agent/HttpClientDownloader.cs b/src/DotnetSpider/Agent/HttpClientDownloader.cs
index 07550ad9..bde90507 100644
--- a/src/DotnetSpider/Agent/HttpClientDownloader.cs
+++ b/src/DotnetSpider/Agent/HttpClientDownloader.cs
@@ -122,7 +122,7 @@ namespace DotnetSpider.Agent
 						stringContent.Content,
 						Encoding.GetEncoding(stringContent.EncodingName), stringContent.MediaType);
 				}
-				else if (content is ByteArrayContent byteArrayContent)
+				else if (content is ByteArrayContent byteArrayContent && byteArrayContent.Bytes != null)
 				{
 					httpRequestMessage.Content = new System.Net.Http.ByteArrayContent(byteArrayContent.Bytes);
 				}