frontend/src/components/TopNav.tsx

@@ -65,7 +65,7 @@ export default (({ user }: Props) => {
   const postCount = tag?.postCount ?? 0
 
   const wikiPageFlg = Boolean (/^\/wiki\/(?!new|changes)[^\/]+/.test (location.pathname) && wikiId)
-  const wikiTitle = location.pathname.split ('/')[2]
+  const wikiTitle = location.pathname.split ('/')[2] ?? ''
   const menu: Menu = [
       { name: '広場', to: '/posts', subMenu: [
 	  { name: '一覧', to: '/posts' },

frontend/src/lib/prefetchers.ts

@@ -4,7 +4,9 @@ import { match } from 'path-to-regexp'
 import { fetchPost, fetchPosts, fetchPostChanges } from '@/lib/posts'
 import { postsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
 import { fetchTagByName } from '@/lib/tags'
-import { fetchWikiPageByTitle, fetchWikiPages } from '@/lib/wiki'
+import { fetchWikiPage,
+	 fetchWikiPageByTitle,
+	 fetchWikiPages } from '@/lib/wiki'
 
 type Prefetcher = (qc: QueryClient, url: URL) => Promise<void>
 
@@ -33,12 +35,20 @@ const prefetchWikiPageShow: Prefetcher = async (qc, url) => {
       queryKey: wikiKeys.show (title, { version }),
       queryFn:  () => fetchWikiPageByTitle (title, { version }) })
 
-  if (wikiPage?.body)
+  if (wikiPage)
+    {
+      const effectiveId = String (wikiPage.id ?? '')
+      await qc.prefetchQuery ({
+	  queryKey: wikiKeys.show (effectiveId, { }),
+	  queryFn: () => fetchWikiPage (effectiveId, { } ) })
+
+      if (wikiPage.body)
 	{
 	  await qc.prefetchQuery ({
 	      queryKey: wikiKeys.index ({ }),
 	      queryFn: () => fetchWikiPages ({ }) })
 	}
+    }
 
   const effectiveTitle = wikiPage?.title ?? title
 

frontend/src/lib/wiki.ts

@@ -22,7 +22,7 @@ export const fetchWikiPageByTitle = async (
 ): Promise<WikiPage | null> => {
   try
   {
-    return await apiGet (`/wiki/title/${ title }`, { params: { version } })
+    return await apiGet (`/wiki/title/${ encodeURIComponent (title) }`, { params: { version } })
   }
   catch
   {