#155

frontend/src/pages/posts/PostHistoryPage.tsx

@@ -35,7 +35,7 @@ const renderDiff = (diff: { current: string | null; prev: string | null }) => (
     </>)
 
 
-export default (() => {
+const PostHistoryPage: FC = () => {
   const dialogue = useDialogue ()
 
   const location = useLocation ()
@@ -48,11 +48,11 @@ export default (() => {
   // 投稿列の結合で使用
   let rowsCnt: number
 
-  const { data: tag } =
-      tagId
-      ? useQuery ({ queryKey: tagsKeys.show (tagId),
-		    queryFn: () => fetchTag (tagId) })
-      : { data: null }
+  const tagQueryId = tagId ?? ''
+  const { data: tag } = useQuery ({
+      enabled:  Boolean (tagId),
+      queryKey: tagsKeys.show (tagQueryId),
+      queryFn:  () => fetchTag (tagQueryId) })
 
   const { data, isLoading: loading } = useQuery ({
       queryKey: postsKeys.changes ({ ...(id && { post: id }),
@@ -290,4 +290,6 @@ export default (() => {
 	      <Pagination page={page} totalPages={totalPages}/>
 	    </>)}
       </MainArea>)
-}) satisfies FC
+}
+
+export default PostHistoryPage