diff --git a/addons/web_editor/static/lib/summernote/summernote.js b/addons/web_editor/static/lib/summernote/summernote.js
index 2bcb61bb873..0f9dfaef656 100644
--- a/addons/web_editor/static/lib/summernote/summernote.js
+++ b/addons/web_editor/static/lib/summernote/summernote.js
@@ -1695,7 +1695,7 @@ var dom = {
     isCustomStyleTag: isCustomStyleTag
 };
 
-$$1.summernote = $$1.summernote || {
+$$1.summernote = {
     lang: {}
 };
 $$1.extend($$1.summernote.lang, {
diff --git a/addons/web_editor/static/src/js/wysiwyg/wysiwyg_iframe.js b/addons/web_editor/static/src/js/wysiwyg/wysiwyg_iframe.js
index be6ac41e5cb..0d75f360731 100644
--- a/addons/web_editor/static/src/js/wysiwyg/wysiwyg_iframe.js
+++ b/addons/web_editor/static/src/js/wysiwyg/wysiwyg_iframe.js
@@ -13,6 +13,8 @@ $.fn.summernote = function () {
     var summernote = this[0].ownerDocument.defaultView._fnSummenoteSlave || _fnSummernoteMaster;
     return summernote.apply(this, arguments);
 };
+window._fnSummernoteMaster = $.fn.summernote;
+window._summernoteMaster = _summernoteMaster;
 
 /**
  * Add option (inIframe) to load Wysiwyg in an iframe.
diff --git a/addons/web_editor/static/src/xml/wysiwyg.xml b/addons/web_editor/static/src/xml/wysiwyg.xml
index d28efeee92b..87d984b6fcd 100644
--- a/addons/web_editor/static/src/xml/wysiwyg.xml
+++ b/addons/web_editor/static/src/xml/wysiwyg.xml
@@ -23,19 +23,15 @@
             <div id="iframe_target" style="height: calc(100vh - 6px);"/>
             <script type="text/javascript">
                 window.$ = window.jQuery = window.top.jQuery;
-                var _summernoteMaster = $.summernote;
-                var _fnSummernoteMaster = $.fn.summernote;
-                delete $.summernote;
-                delete $.fn.summernote;
             </script>
             <script type="text/javascript" src="/web_editor/static/lib/summernote/summernote.js"/>
             <script type="text/javascript">
                 window._summernoteSlave = $.summernote;
                 window._summernoteSlave.iframe = true;
-                window._summernoteSlave.lang = _summernoteMaster.lang;
+                window._summernoteSlave.lang = window.top._summernoteMaster.lang;
                 window._fnSummenoteSlave = $.fn.summernote;
-                $.summernote = _summernoteMaster;
-                $.fn.summernote = _fnSummernoteMaster;
+                $.summernote = window.top._summernoteMaster;
+                $.fn.summernote = window.top._fnSummernoteMaster;
                 if (window.top.<t t-esc="updateIframeId"/>) {
                     window.top.<t t-esc="updateIframeId"/>(<t t-esc="avoidDoubleLoad"/>);
                 }