diff --git a/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigV2rayService.cs b/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigV2rayService.cs
index e7fa7f0d..f07a9c94 100644
--- a/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigV2rayService.cs
+++ b/v2rayN/ServiceLib/Services/CoreConfig/CoreConfigV2rayService.cs
@@ -916,7 +916,7 @@ namespace ServiceLib.Services.CoreConfig
                         kcpSettings.header = new Header4Ray
                         {
                             type = node.HeaderType,
-                            domain = host
+                            domain = host.IsNullOrEmpty() ? null : host
                         };
                         if (Utils.IsNotEmpty(path))
                         {