diff --git a/CHANGELOG.md b/CHANGELOG.md
index d0b98db96a..a9944d4b5e 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -83,6 +83,7 @@
 - Fix: AP Link等は添付ファイル扱いしないようになど (#13754)
 - Fix: FTTが有効かつsinceIdのみを指定した場合に帰って来るレスポンスが逆順である問題を修正
 - Fix: `/i/notifications`に `includeTypes`か`excludeTypes`を指定しているとき、通知が存在するのに空配列を返すことがある問題を修正
+- Fix: 複数idを指定する`users/show`が関係ないユーザを返すことがある問題を修正
 
 ## 2024.3.1
 
diff --git a/packages/backend/src/misc/json-schema.ts b/packages/backend/src/misc/json-schema.ts
index a620d7c94b..41e5bfe9e4 100644
--- a/packages/backend/src/misc/json-schema.ts
+++ b/packages/backend/src/misc/json-schema.ts
@@ -228,7 +228,7 @@ export type SchemaTypeDef<p extends Schema> =
 			p['items']['allOf'] extends ReadonlyArray<Schema> ? UnionToIntersection<UnionSchemaType<NonNullable<p['items']['allOf']>>>[] :
 			never
 		) :
-		p['items'] extends NonNullable<Schema> ? SchemaTypeDef<p['items']>[] :
+		p['items'] extends NonNullable<Schema> ? SchemaType<p['items']>[] :
 		any[]
 	) :
 	p['anyOf'] extends ReadonlyArray<Schema> ? UnionSchemaType<p['anyOf']> & PartialIntersection<UnionSchemaType<p['anyOf']>> :
diff --git a/packages/backend/src/server/api/endpoints/users/show.ts b/packages/backend/src/server/api/endpoints/users/show.ts
index bd81989cb9..26cfa921c5 100644
--- a/packages/backend/src/server/api/endpoints/users/show.ts
+++ b/packages/backend/src/server/api/endpoints/users/show.ts
@@ -110,9 +110,11 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				});
 
 				// リクエストされた通りに並べ替え
+				// 順番は保持されるけど数は減ってる可能性がある
 				const _users: MiUser[] = [];
 				for (const id of ps.userIds) {
-					_users.push(users.find(x => x.id === id)!);
+					const user = users.find(x => x.id === id);
+					if (user != null) _users.push(user);
 				}
 
 				return await Promise.all(_users.map(u => this.userEntityService.pack(u, me, {
diff --git a/packages/frontend/src/components/MkPostForm.vue b/packages/frontend/src/components/MkPostForm.vue
index 7dbc127298..41d603e40f 100644
--- a/packages/frontend/src/components/MkPostForm.vue
+++ b/packages/frontend/src/components/MkPostForm.vue
@@ -190,7 +190,7 @@ const localOnly = ref(props.initialLocalOnly ?? (defaultStore.state.rememberNote
 const visibility = ref(props.initialVisibility ?? (defaultStore.state.rememberNoteVisibility ? defaultStore.state.visibility : defaultStore.state.defaultNoteVisibility));
 const visibleUsers = ref<Misskey.entities.UserDetailed[]>([]);
 if (props.initialVisibleUsers) {
-	props.initialVisibleUsers.forEach(pushVisibleUser);
+	props.initialVisibleUsers.forEach(u => pushVisibleUser(u));
 }
 const reactionAcceptance = ref(defaultStore.state.reactionAcceptance);
 const autocomplete = ref(null);
@@ -336,7 +336,7 @@ if (props.reply && ['home', 'followers', 'specified'].includes(props.reply.visib
 			misskeyApi('users/show', {
 				userIds: props.reply.visibleUserIds.filter(uid => uid !== $i.id && uid !== props.reply?.userId),
 			}).then(users => {
-				users.forEach(pushVisibleUser);
+				users.forEach(u => pushVisibleUser(u));
 			});
 		}
 
@@ -967,11 +967,7 @@ onMounted(() => {
 				}
 				if (draft.data.visibleUserIds) {
 					misskeyApi('users/show', { userIds: draft.data.visibleUserIds }).then(users => {
-						for (let i = 0; i < users.length; i++) {
-							if (users[i].id === draft.data.visibleUserIds[i]) {
-								pushVisibleUser(users[i]);
-							}
-						}
+						users.forEach(u => pushVisibleUser(u));
 					});
 				}
 			}