diff --git a/packages/node_modules/@node-red/editor-client/src/js/ui/actions.js b/packages/node_modules/@node-red/editor-client/src/js/ui/actions.js
index 8ebc97cda..c7c5dd950 100644
--- a/packages/node_modules/@node-red/editor-client/src/js/ui/actions.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/ui/actions.js
@@ -4,6 +4,12 @@ RED.actions = (function() {
     }
 
     function addAction(name,handler) {
+        if (typeof handler !== 'function') {
+            throw new Error("Action handler not a function");
+        }
+        if (actions[name]) {
+            throw new Error("Cannot override existing action");
+        }
         actions[name] = handler;
     }
     function removeAction(name) {
@@ -12,9 +18,11 @@ RED.actions = (function() {
     function getAction(name) {
         return actions[name];
     }
-    function invokeAction(name,args) {
+    function invokeAction() {
+        var args = Array.prototype.slice.call(arguments);
+        var name = args.shift();
         if (actions.hasOwnProperty(name)) {
-            actions[name](args);
+            actions[name].apply(null, args);
         }
     }
     function listActions() {