From f36e2725bd87b474f709217afcdd44cd02c8bb45 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E3=81=BF=E3=81=A6=E3=82=8B=E3=81=9E?= <miteruzo@naver.com>
Date: Fri, 13 Mar 2026 07:15:48 +0900
Subject: [PATCH 1/4] =?UTF-8?q?'frontend/src/types.ts'=20=E3=82=92?=
 =?UTF-8?q?=E6=9B=B4=E6=96=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 frontend/src/types.ts | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/frontend/src/types.ts b/frontend/src/types.ts
index d7b0afd..f40f533 100644
--- a/frontend/src/types.ts
+++ b/frontend/src/types.ts
@@ -54,8 +54,8 @@ export type Post = {
 
 export type PostTagChange = {
     post:       Post
-    tag:        Tag
-    user?:      User
+    tag:        Tag | null
+    user:       User | null
     changeType: 'add' | 'remove'
     timestamp:  string }
 
-- 
2.34.1


From 8b6f20bae35f6bacc54e1db5484b85d9748bec41 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E3=81=BF=E3=81=A6=E3=82=8B=E3=81=9E?= <miteruzo@naver.com>
Date: Fri, 13 Mar 2026 07:21:15 +0900
Subject: [PATCH 2/4] =?UTF-8?q?'frontend/src/pages/posts/PostHistoryPage.t?=
 =?UTF-8?q?sx'=20=E3=82=92=E6=9B=B4=E6=96=B0?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 frontend/src/pages/posts/PostHistoryPage.tsx | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/frontend/src/pages/posts/PostHistoryPage.tsx b/frontend/src/pages/posts/PostHistoryPage.tsx
index 7fe2202..b985ea1 100644
--- a/frontend/src/pages/posts/PostHistoryPage.tsx
+++ b/frontend/src/pages/posts/PostHistoryPage.tsx
@@ -92,7 +92,9 @@ export default (() => {
 				</PrefetchLink>
 			      </td>)}
 			  <td className="p-2">
-			    <TagLink tag={change.tag} withWiki={false} withCount={false}/>
+			    {change.tag
+			     ? <TagLink tag={change.tag} withWiki={false} withCount={false}/>
+				 : '(マスタ削除済のタグ) '
 			    {`を${ change.changeType === 'add' ? '記載' : '消除' }`}
 			  </td>
 			  <td className="p-2">
-- 
2.34.1


From f8f870fccc9b9c3110698fd8725ad20402cbe6ce Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E3=81=BF=E3=81=A6=E3=82=8B=E3=81=9E?= <miteruzo@naver.com>
Date: Fri, 13 Mar 2026 07:21:55 +0900
Subject: [PATCH 3/4] #290

---
 frontend/src/pages/posts/PostHistoryPage.tsx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/frontend/src/pages/posts/PostHistoryPage.tsx b/frontend/src/pages/posts/PostHistoryPage.tsx
index b985ea1..998fe6a 100644
--- a/frontend/src/pages/posts/PostHistoryPage.tsx
+++ b/frontend/src/pages/posts/PostHistoryPage.tsx
@@ -94,7 +94,7 @@ export default (() => {
 			  <td className="p-2">
 			    {change.tag
 			     ? <TagLink tag={change.tag} withWiki={false} withCount={false}/>
-				 : '(マスタ削除済のタグ) '
+				 : '(マスタ削除済のタグ) '}
 			    {`を${ change.changeType === 'add' ? '記載' : '消除' }`}
 			  </td>
 			  <td className="p-2">
-- 
2.34.1


From 2b3b0e4c307378410af1a16e53f95631f4374fcf Mon Sep 17 00:00:00 2001
From: miteruzo <miteruzo@naver.com>
Date: Fri, 13 Mar 2026 12:26:53 +0900
Subject: [PATCH 4/4] #290

---
 frontend/src/pages/posts/PostHistoryPage.tsx | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/frontend/src/pages/posts/PostHistoryPage.tsx b/frontend/src/pages/posts/PostHistoryPage.tsx
index 998fe6a..ab54ad2 100644
--- a/frontend/src/pages/posts/PostHistoryPage.tsx
+++ b/frontend/src/pages/posts/PostHistoryPage.tsx
@@ -71,7 +71,7 @@ export default (() => {
 			  ++rowsCnt
 		      }
 		    return (
-			<tr key={`${ change.timestamp }-${ change.post.id }-${ change.tag.id }`}
+			<tr key={`${ change.timestamp }-${ change.post.id }-${ change.tag?.id }`}
 			    className={cn ('even:bg-gray-100 dark:even:bg-gray-700',
 					   withPost && 'border-t')}>
 			  {withPost && (
@@ -94,7 +94,7 @@ export default (() => {
 			  <td className="p-2">
 			    {change.tag
 			     ? <TagLink tag={change.tag} withWiki={false} withCount={false}/>
-				 : '(マスタ削除済のタグ) '}
+			     : '(マスタ削除済のタグ) '}
 			    {`を${ change.changeType === 'add' ? '記載' : '消除' }`}
 			  </td>
 			  <td className="p-2">
-- 
2.34.1