undefinedはメンバーを持たない

src/components/ArticleCard.astro

@@ -19,7 +19,7 @@ const { title, link, thumbnail, poster_name, poster_icon_url, tag }: Props = Ast
   <div class="p-4">
     <div class="aspect-oblong sms:aspect-square sm:aspect-oblong rounded-t-xl bg-blue-200 relative p-0 flex items-center justify-center">
       <slot />
-      {(tag.text !== undefined) &&
+      {(tag !== undefined) &&
         <div class={"text-xs text-center absolute left-4 top-3 py-1 px-2 font-bold rounded-full text-white "+tag.bg}>{tag}</div>
       }
     </div>