diff --git a/src/DotXxlJob.Core/XxlRestfulServiceHandler.cs b/src/DotXxlJob.Core/XxlRestfulServiceHandler.cs
index 13a2fcd..82529fe 100644
--- a/src/DotXxlJob.Core/XxlRestfulServiceHandler.cs
+++ b/src/DotXxlJob.Core/XxlRestfulServiceHandler.cs
@@ -106,7 +106,7 @@ namespace DotXxlJob.Core
             {
                 bodyText = await reader.ReadToEndAsync();
             }
-            return bodyText;
+            return bodyText??string.Emppty;
         }
 
         #region rpc service