Add null check

packages/app/src/components/PageDeleteModal.tsx

@@ -229,7 +229,7 @@ const PageDeleteModal: FC = () => {
       return pages.map(page => (
         <p key={page.data._id} className="mb-1">
           <code>{ page.data.path }</code>
-          { !page.meta?.isDeletable && <span className="ml-3 text-danger"><strong>(CAN NOT TO DELETE)</strong></span> }
+          { page.meta?.isDeletable != null && !page.meta?.isDeletable && <span className="ml-3 text-danger"><strong>(CAN NOT TO DELETE)</strong></span> }
         </p>
       ));
     }