diff --git a/frontend/src/components/TopNav.tsx b/frontend/src/components/TopNav.tsx
index fe9cdd9..db5adcd 100644
--- a/frontend/src/components/TopNav.tsx
+++ b/frontend/src/components/TopNav.tsx
@@ -9,6 +9,7 @@ import TopNavUser from '@/components/TopNavUser'
 import { WikiIdBus } from '@/lib/eventBus/WikiIdBus'
 import { materialsKeys, tagsKeys, wikiKeys } from '@/lib/queryKeys'
 import { useClientBehaviourSettings } from '@/lib/useClientBehaviourSettings'
+import { canEditContent } from '@/lib/users'
 import { fetchTag, fetchTagByName } from '@/lib/tags'
 import { fetchMaterial } from '@/lib/materials'
 import { cn } from '@/lib/utils'
@@ -30,6 +31,7 @@ export const menuOutline = (
 	pathName: string },
 ): Menu => {
   const postCount = tag?.postCount ?? material?.tag?.postCount ?? 0
+  const editable = canEditContent (user)
 
   const wikiPageFlg = Boolean (/^\/wiki\/(?!new|changes)[^/]+/.test (pathName) && wikiId)
   const wikiTitle = pathName.split ('/')[2] ?? ''
@@ -42,10 +44,8 @@ export const menuOutline = (
       { name: '広場', to: '/posts', subMenu: [
 	  { name: '一覧', to: '/posts' },
 	  { name: '検索', to: '/posts/search' },
-	  { name: '追加', to: '/posts/new',
-	    visible: ['admin', 'member'].includes (user?.role) },
-	  { name: '取込', to: '/posts/import',
-	    visible: ['admin', 'member'].includes (user?.role) },
+	  { name: '追加', to: '/posts/new', visible: editable },
+	  { name: '取込', to: '/posts/import', visible: editable },
 	  { name: '全体履歴', to: '/posts/changes' },
 	  { name: 'ヘルプ', to: '/wiki/ヘルプ:広場' }] },
       { name: 'タグ', to: '/tags', subMenu: [
@@ -61,8 +61,7 @@ export const menuOutline = (
 	    visible: tagFlg && tag?.category !== 'nico' }] },
       { name: '素材', to: '/materials', visible: true, subMenu: [
 	  { name: '一覧', to: '/materials' },
-	  { name: '追加', to: '/materials/new',
-	    visible: ['admin', 'member'].includes (user?.role) },
+	  { name: '追加', to: '/materials/new', visible: editable },
 	  { name: '抑止', to: '/materials/suppressions',
 	    visible: user?.role === 'admin' },
 	  { name: '全体履歴', to: '/materials/changes' },
@@ -75,8 +74,7 @@ export const menuOutline = (
 	    visible: materialFlg }] },
       { name: 'Wiki', to: '/wiki/ヘルプ:ホーム', base: '/wiki', subMenu: [
 	  { name: '検索', to: '/wiki' },
-	  { name: '新規', to: '/wiki/new',
-	    visible: ['member', 'admin'].includes (user?.role) },
+	  { name: '新規', to: '/wiki/new', visible: editable },
 	  { name: '全体履歴', to: '/wiki/changes' },
 	  { name: 'ヘルプ', to: '/wiki/ヘルプ:Wiki' },
 	  { component: <Separator/>, visible: wikiPageFlg },
@@ -84,7 +82,7 @@ export const menuOutline = (
 	    visible: wikiPageFlg },
 	  { name: '履歴', to: `/wiki/changes?id=${ wikiId }`, visible: wikiPageFlg },
 	  { name: '編輯', to: `/wiki/${ wikiId || wikiTitle }/edit`,
-	    visible: wikiPageFlg && ['admin', 'member'].includes (user?.role) }] },
+	    visible: wikiPageFlg && editable }] },
       { name: 'おたのしみ', visible: false, subMenu: [
 	  { name: '上映会 (β)', to: '/theatres/1' },
 	  { name: 'グカネータ (β)', to: '/gekanator' }] },
diff --git a/frontend/src/lib/postImportStorage.ts b/frontend/src/lib/postImportStorage.ts
index 30fba58..360963a 100644
--- a/frontend/src/lib/postImportStorage.ts
+++ b/frontend/src/lib/postImportStorage.ts
@@ -223,7 +223,7 @@ const sanitiseRow = (value: unknown): PostImportRow | null => {
 	value.importErrors == null
 	? undefined
 	: ensureStringListRecord (value.importErrors)
-    if (value.importErrors != null && importErrors == null)
+    if (importErrors === null)
       return null
     if (!(Array.isArray (value.baseWarnings))
 	|| !(value.baseWarnings.every (_1 => typeof _1 === 'string')))
@@ -261,14 +261,14 @@ const sanitiseRow = (value: unknown): PostImportRow | null => {
 	provenance: value.provenance as Record<string, PostImportOrigin>,
 	tagSources: value.tagSources as Record<PostImportOrigin, string> | undefined,
 	status: value.status,
-	skipReason: value.skipReason,
+	skipReason: value.skipReason ?? undefined,
 	existingPostId:
 	    isPositiveInteger (value.existingPostId) ? Number (value.existingPostId) : undefined,
 	metadataUrl: typeof value.metadataUrl === 'string' ? value.metadataUrl : undefined,
 	resetSnapshot,
 	createdPostId:
 	    isPositiveInteger (value.createdPostId) ? Number (value.createdPostId) : undefined,
-	importStatus: value.importStatus }
+	importStatus: value.importStatus ?? undefined }
 }
 
 
diff --git a/frontend/src/pages/posts/PostImportResultPage.tsx b/frontend/src/pages/posts/PostImportResultPage.tsx
index 5124e3b..9045161 100644
--- a/frontend/src/pages/posts/PostImportResultPage.tsx
+++ b/frontend/src/pages/posts/PostImportResultPage.tsx
@@ -123,7 +123,7 @@ const PostImportResultPage: FC<Props> = ({ user }) => {
 	    row.status === 'failed'
 	    && row.recoverable
 	    && Object.keys (row.errors ?? { }).length > 0)
-	const nextRows = mergedRows.map (row => {
+	const nextRows = mergedRows.map ((row): PostImportRow => {
 	  const recoverable = recoverableRows.find (_1 => _1.sourceRow === row.sourceRow)
 	  if (recoverable == null)
 	    return row
diff --git a/frontend/src/pages/posts/PostImportReviewPage.tsx b/frontend/src/pages/posts/PostImportReviewPage.tsx
index 2342ac6..207694c 100644
--- a/frontend/src/pages/posts/PostImportReviewPage.tsx
+++ b/frontend/src/pages/posts/PostImportReviewPage.tsx
@@ -234,7 +234,7 @@ const PostImportReviewPage: FC<Props> = ({ user }) => {
 	  row.status === 'failed'
 	  && row.recoverable
 	  && Object.keys (row.errors ?? { }).length > 0)
-      const nextRows = mergedResults.map (row => {
+      const nextRows = mergedResults.map ((row): PostImportRow => {
 	const recoverable = recoverableRows.find (rr => rr.sourceRow === row.sourceRow)
 	if (recoverable == null)
 	  return row