#318

frontend/src/components/TopNav.tsx

@@ -44,7 +44,7 @@ export const menuOutline = ({ tag, wikiId, user, pathName }: {
 	  { name: 'ヘルプ', to: '/wiki/ヘルプ:タグ' },
 	  { component: <Separator/>, visible: tagFlg },
 	  { name: `広場 (${ postCount || 0 })`,
-	    to: `/posts?tags=${ encodeURIComponent (tag?.name) }`,
+	    to: `/posts?tags=${ encodeURIComponent (tag?.name ?? '') }`,
 	    visible: tagFlg },
 	  { name: '履歴', to: `/tags/changes?id=${ tag?.id }`, visible: false }] },
       { name: '素材', to: '/materials', visible: false, subMenu: [

frontend/src/pages/tags/TagDetailPage.tsx

@@ -72,8 +72,8 @@ export default (() => {
 
     setName (tag.name)
     setCategory (tag.category as Category)
-    setAliases (tag.aliases?.join (' '))
-    setParentTags (tag.parents?.map (t => t.name).join (' '))
+    setAliases (tag.aliases.join (' '))
+    setParentTags (tag.parents.map (t => t.name).join (' '))
     setDisabled (tag.category === 'nico')
   }, [tag])