diff --git a/v2rayN/v2rayN/Handler/V2rayConfigHandler.cs b/v2rayN/v2rayN/Handler/V2rayConfigHandler.cs
index 3242cbb124b..596a95b3f61 100644
--- a/v2rayN/v2rayN/Handler/V2rayConfigHandler.cs
+++ b/v2rayN/v2rayN/Handler/V2rayConfigHandler.cs
@@ -220,6 +220,10 @@ private static int routingUserRule(RulesItem rules, ref V2rayConfig v2rayConfig)
                     var it = Utils.DeepCopy(rules);
                     it.ip = null;
                     it.type = "field";
+                    if (Utils.IsNullOrEmpty(rules.port))
+                    {
+                        it.port = null;
+                    }
                     v2rayConfig.routing.rules.Add(it);
                     hasDomainIp = true;
                 }
@@ -228,6 +232,10 @@ private static int routingUserRule(RulesItem rules, ref V2rayConfig v2rayConfig)
                     var it = Utils.DeepCopy(rules);
                     it.domain = null;
                     it.type = "field";
+                    if (Utils.IsNullOrEmpty(rules.port))
+                    {
+                        it.port = null;
+                    }
                     v2rayConfig.routing.rules.Add(it);
                     hasDomainIp = true;
                 }