diff --git a/packages/node_modules/@node-red/editor-client/src/js/red.js b/packages/node_modules/@node-red/editor-client/src/js/red.js
index 0ba08878a..7c3576e13 100644
--- a/packages/node_modules/@node-red/editor-client/src/js/red.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/red.js
@@ -711,7 +711,7 @@ var RED = (function() {
             throw new Error("RED already initialised");
         }
         initialised = true;
-        ace.require("ace/ext/language_tools");
+        if(window.ace) { window.ace.require("ace/ext/language_tools"); }
         options = options || {};
         options.apiRootUrl = options.apiRootUrl || "";
         if (options.apiRootUrl && !/\/$/.test(options.apiRootUrl)) {
diff --git a/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js b/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
index 9c3274441..7f7decaa1 100644
--- a/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
+++ b/packages/node_modules/@node-red/editor-client/src/js/ui/editor.js
@@ -2850,7 +2850,7 @@ var buildingEditDialog = false;
 
     return {
         init: function() {
-            ace.config.set('basePath', 'vendor/ace');
+            if(window.ace) { window.ace.config.set('basePath', 'vendor/ace'); }
             RED.tray.init();
             RED.actions.add("core:confirm-edit-tray", function() {
                 $(document.activeElement).blur();