diff --git a/packages/backend/src/core/entities/UserEntityService.ts b/packages/backend/src/core/entities/UserEntityService.ts
index 6abf205a56..4237de7170 100644
--- a/packages/backend/src/core/entities/UserEntityService.ts
+++ b/packages/backend/src/core/entities/UserEntityService.ts
@@ -471,8 +471,8 @@ export class UserEntityService implements OnModuleInit {
 			(profile.followersVisibility === 'followers') && (relation && relation.isFollowing) ? user.followersCount :
 			null;
 
-		const isModerator = isMe && isDetailed ? this.roleService.isModerator(user) : null;
-		const isAdmin = isMe && isDetailed ? this.roleService.isAdministrator(user) : null;
+		const isModerator = isMe && isDetailed ? this.roleService.isModerator(user) : false; // この場合undefinedにしたい(レスポンスに含める必要がないため)が、念のため後方互換性を確保
+		const isAdmin = isMe && isDetailed ? this.roleService.isAdministrator(user) : false; // この場合undefinedにしたい(レスポンスに含める必要がないため)が、念のため後方互換性を確保
 		const unreadAnnouncements = isMe && isDetailed ?
 			(await this.announcementService.getUnreadAnnouncements(user)).map((announcement) => ({
 				createdAt: this.idService.parse(announcement.id).date.toISOString(),
diff --git a/packages/backend/src/models/json-schema/user.ts b/packages/backend/src/models/json-schema/user.ts
index dfefcd96f2..d4b22cc403 100644
--- a/packages/backend/src/models/json-schema/user.ts
+++ b/packages/backend/src/models/json-schema/user.ts
@@ -465,11 +465,11 @@ export const packedMeDetailedOnlySchema = {
 		},
 		isModerator: {
 			type: 'boolean',
-			nullable: true, optional: false,
+			nullable: false, optional: false, // optionalにしたいが念のため後方互換性を確保
 		},
 		isAdmin: {
 			type: 'boolean',
-			nullable: true, optional: false,
+			nullable: false, optional: false, // optionalにしたいが念のため後方互換性を確保
 		},
 		injectFeaturedNote: {
 			type: 'boolean',
diff --git a/packages/frontend/src/pages/user/index.activity.vue b/packages/frontend/src/pages/user/index.activity.vue
index 45bc35067b..210021618e 100644
--- a/packages/frontend/src/pages/user/index.activity.vue
+++ b/packages/frontend/src/pages/user/index.activity.vue
@@ -34,7 +34,7 @@ const props = withDefaults(defineProps<{
 	limit: 50,
 });
 
-const chartSrc = ref('per-user-notes');
+const chartSrc = ref<'per-user-notes' | 'per-user-pv'>('per-user-notes');
 
 function showMenu(ev: MouseEvent) {
 	os.popupMenu([{