diff --git a/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js b/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
index 3f5b2dff4..7ab624222 100644
--- a/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
+++ b/packages/node_modules/@node-red/nodes/core/network/10-mqtt.js
@@ -469,6 +469,7 @@ module.exports = function(RED) {
         this.broker = n.broker;
         this.brokerConn = RED.nodes.getNode(this.broker);
         var node = this;
+        var chk = /[\+#]/;
 
         if (this.brokerConn) {
             this.status({fill:"red",shape:"ring",text:"node-red:common.status.disconnected"});
@@ -487,6 +488,7 @@ module.exports = function(RED) {
                 }
                 if ( msg.hasOwnProperty("payload")) {
                     if (msg.hasOwnProperty("topic") && (typeof msg.topic === "string") && (msg.topic !== "")) { // topic must exist
+                        if (chk.test(msg.topic)) { node.warn(RED._("mqtt.errors.invalid-topic")); }
                         this.brokerConn.publish(msg, done);  // send the message
                     } else {
                         node.warn(RED._("mqtt.errors.invalid-topic"));