diff --git a/public/red/comms.js b/public/red/comms.js
index 8a8d1e174..b6aba53db 100644
--- a/public/red/comms.js
+++ b/public/red/comms.js
@@ -95,15 +95,15 @@ RED.comms = (function() {
     }
     
     function unsubscribe(topic,callback) {
-        if (subscriptions.topic) {
-            for (var i=0;i<subscriptions.topic.length;i++) {
-                if (subscriptions.topic[i] === callback) {
-                    subscriptions.topic.splice(i,1);
+        if (subscriptions[topic]) {
+            for (var i=0;i<subscriptions[topic].length;i++) {
+                if (subscriptions[topic][i] === callback) {
+                    subscriptions[topic].splice(i,1);
                     break;
                 }
             }
-            if (subscriptions.topic.length === 0) {
-                delete subscriptions.topic;
+            if (subscriptions[topic].length === 0) {
+                delete subscriptions[topic];
             }
         }
     }