From beb68286933c83c15fa06a5c056f6fc74ca17ac8 Mon Sep 17 00:00:00 2001
From: Alan <alan@roojs.com>
Date: Wed, 16 Mar 2022 14:14:19 +0800
Subject: [PATCH] Roo/HtmlEditorCore.js

---
 Roo/HtmlEditorCore.js | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Roo/HtmlEditorCore.js b/Roo/HtmlEditorCore.js
index c7cfbccaea..ff6ff0db36 100644
--- a/Roo/HtmlEditorCore.js
+++ b/Roo/HtmlEditorCore.js
@@ -355,7 +355,9 @@ Roo.extend(Roo.HtmlEditorCore, Roo.Component,  {
         //Roo.log("HtmlEditorCore:syncValue (EDITOR->TEXT)");
         if(this.initialized){
             
-            this.undoManager.addEvent();
+            if (this.undoManager) {
+                this.undoManager.addEvent();
+            }
 
             
             var bd = (this.doc.body || this.doc.documentElement);
-- 
2.39.2