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 2b4968483..afa0066f4 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
@@ -161,12 +161,12 @@ module.exports = function(RED) {
                 if(typeof val === "string") {
                     count++;
                     _clone[key] = val;
-                } else {
-                    count++;
+                } else if (val !== undefined && val !== null) {
                     try {
                         _clone[key] = JSON.stringify(val)
+                        count++;
                     } catch  (err) {
-                        console.log('MQTT v5 Property value can not be converted to a String')
+                        // Silently drop property
                     }
                 }
             });