diff --git a/addons/web_editor/static/src/js/backend/field_html.js b/addons/web_editor/static/src/js/backend/field_html.js
index 7f9a710de8c..21e93191180 100644
--- a/addons/web_editor/static/src/js/backend/field_html.js
+++ b/addons/web_editor/static/src/js/backend/field_html.js
@@ -325,6 +325,11 @@ var FieldHtml = basic_fields.DebouncedField.extend(TranslatableFieldMixin, {
                         return;
                     }
                     var cwindow = self.$iframe[0].contentWindow;
+                    try {
+                        cwindow.document;
+                    } catch (e) {
+                        return;
+                    }
                     cwindow.document
                         .open("text/html", "replace")
                         .write(