diff --git a/editor/libeditor/HTMLEditSubActionHandler.cpp b/editor/libeditor/HTMLEditSubActionHandler.cpp
index d0b174d8cded..c73fb09612b0 100644
--- a/editor/libeditor/HTMLEditSubActionHandler.cpp
+++ b/editor/libeditor/HTMLEditSubActionHandler.cpp
@@ -9431,6 +9431,7 @@ nsresult HTMLEditor::AdjustCaretPositionAndEnsurePaddingBRElement(
       if (HTMLEditUtils::IsInvisibleBRElement(*previousEditableContent) &&
           !EditorUtils::IsPaddingBRElementForEmptyLastLine(
               *previousEditableContent)) {
+        AutoEditorDOMPointChildInvalidator lockOffset(point);
         Result<CreateElementResult, nsresult> insertPaddingBRElementResult =
             InsertPaddingBRElementForEmptyLastLineWithTransaction(point);
         if (MOZ_UNLIKELY(insertPaddingBRElementResult.isErr())) {