diff --git a/src/methods/allow.js b/src/methods/allow.js
index d195c24..403ba6e 100644
--- a/src/methods/allow.js
+++ b/src/methods/allow.js
@@ -59,9 +59,11 @@ module.exports.address = async function (address, port, protocol) {
     if (!checkAddress) return false;
 
     // port validation
-    if (typeof port !== "number") throw new Error("The port must be type of number.");
-    let checkPort = util.checkAppropriatePort(port);
-    if (!checkPort) return false;
+    if (port) {
+      if (typeof port !== "number") throw new Error("The port must be type of number.");
+      let checkPort = util.checkAppropriatePort(port);
+      if (!checkPort) return false;
+    };
 
     // protocol (tcp/udp) validation
     if (protocol) {
diff --git a/src/methods/deny.js b/src/methods/deny.js
index 219c61c..3cee983 100644
--- a/src/methods/deny.js
+++ b/src/methods/deny.js
@@ -59,9 +59,11 @@ module.exports.address = async function (address, port, protocol) {
     if (!checkAddress) return false;
 
     // port validation
-    if (typeof port !== "number") throw new Error("The port must be type of number.");
-    let checkPort = util.checkAppropriatePort(port);
-    if (!checkPort) return false;
+    if (port) {
+      if (typeof port !== "number") throw new Error("The port must be type of number.");
+      let checkPort = util.checkAppropriatePort(port);
+      if (!checkPort) return false;
+    };
 
     // protocol (tcp/udp) validation
     if (protocol) {