diff --git a/backend/app/models/nico_tag_relation.rb b/backend/app/models/nico_tag_relation.rb
index ff4f3a6..d2c4a82 100644
--- a/backend/app/models/nico_tag_relation.rb
+++ b/backend/app/models/nico_tag_relation.rb
@@ -6,6 +6,7 @@ class NicoTagRelation < ApplicationRecord
   validates :tag_id, presence: true
 
   validate :nico_tag_must_be_nico
+  validate :tag_mustnt_be_nico
 
   private
 
diff --git a/frontend/src/pages/wiki/WikiDetailPage.tsx b/frontend/src/pages/wiki/WikiDetailPage.tsx
index 058a5fc..b5ebd79 100644
--- a/frontend/src/pages/wiki/WikiDetailPage.tsx
+++ b/frontend/src/pages/wiki/WikiDetailPage.tsx
@@ -36,9 +36,16 @@ export default () => {
     if (/^\d+$/.test (title))
       {
 	void (async () => {
-	  const res = await axios.get (`${ API_BASE_URL }/wiki/${ title }`)
-	  const data = res.data as WikiPage
-	  navigate (`/wiki/${ data.title }`, { replace: true })
+	  try
+	  {
+	    const res = await axios.get (`${ API_BASE_URL }/wiki/${ title }`)
+	    const data = res.data as WikiPage
+	    navigate (`/wiki/${ encodeURIComponent(data.title) }`, { replace: true })
+	  }
+	  catch
+	  {
+	    ;
+	  }
 	}) ()
 
 	return
@@ -51,6 +58,8 @@ export default () => {
 	    `${ API_BASE_URL }/wiki/title/${ encodeURIComponent (title) }`,
 	    { params: version ? { version } : { } })
 	const data = toCamel (res.data as any, { deep: true }) as WikiPage
+	if (data.title !== title)
+	  navigate (`/wiki/${ encodeURIComponent(data.title) }`, { replace: true })
 	setWikiPage (data)
 	WikiIdBus.set (data.id)
       }