diff --git a/packages/node_modules/@node-red/nodes/core/network/32-udp.js b/packages/node_modules/@node-red/nodes/core/network/32-udp.js
index 894c19d77..d42d3a7c3 100644
--- a/packages/node_modules/@node-red/nodes/core/network/32-udp.js
+++ b/packages/node_modules/@node-red/nodes/core/network/32-udp.js
@@ -178,7 +178,7 @@ module.exports = function(RED) {
         var sock;
         var p = this.outport || this.port || "0";
         node.tout = setTimeout(function() {
-            if (udpInputPortsInUse[p]) {
+            if ((p != 0) && udpInputPortsInUse[p]) {
                 sock = udpInputPortsInUse[p];
                 if (node.multicast != "false") {
                     sock.setBroadcast(true);