From 4ac7b3bc0f2f2ca0af0a7b0f2607a7f684a79721 Mon Sep 17 00:00:00 2001
From: wangjun <wangjun@chemical.ai>
Date: Thu, 26 Aug 2021 15:35:54 +0800
Subject: [PATCH] Fix object reference not set to an instance of an object for
 http proxy

---
 .../Volo/Abp/Http/Client/DynamicProxying/UrlBuilder.cs          | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/UrlBuilder.cs b/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/UrlBuilder.cs
index 4d77423c7f..78747dd6b0 100644
--- a/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/UrlBuilder.cs
+++ b/framework/src/Volo.Abp.Http.Client/Volo/Abp/Http/Client/DynamicProxying/UrlBuilder.cs
@@ -139,7 +139,7 @@ namespace Volo.Abp.Http.Client.DynamicProxying
                 return dateTimeValue.ToUniversalTime().ToString("O");
             }
 
-            return value.ToString();
+            return value?.ToString();
         }
     }
 }