diff --git a/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts b/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
index f6a7aa1c6c..af92ae4849 100644
--- a/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/hybrid-timeline.ts
@@ -5,7 +5,7 @@
 
 import { Brackets } from 'typeorm';
 import { Inject, Injectable } from '@nestjs/common';
-import type { NotesRepository, ChannelFollowingsRepository } from '@/models/_.js';
+import type { ChannelFollowingsRepository, NotesRepository } from '@/models/_.js';
 import { Endpoint } from '@/server/api/endpoint-base.js';
 import ActiveUsersChart from '@/core/chart/charts/active-users.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
@@ -77,10 +77,8 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 	constructor(
 		@Inject(DI.notesRepository)
 		private notesRepository: NotesRepository,
-
 		@Inject(DI.channelFollowingsRepository)
 		private channelFollowingsRepository: ChannelFollowingsRepository,
-
 		private noteEntityService: NoteEntityService,
 		private roleService: RoleService,
 		private activeUsersChart: ActiveUsersChart,
@@ -191,9 +189,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				followerId: me.id,
 			},
 		});
-		const mutingChannelIds = (followingChannels.length > 0)
-			? await this.channelMutingService.list({ requestUserId: me.id }).then(x => x.map(x => x.id))
-			: [];
+		const mutingChannelIds = await this.channelMutingService.list({ requestUserId: me.id }).then(x => x.map(x => x.id));
 
 		const query = this.queryService.makePaginationQuery(this.notesRepository.createQueryBuilder('note'), ps.sinceId, ps.untilId)
 			.andWhere(new Brackets(qb => {
@@ -224,11 +220,24 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		}
 
 		if (mutingChannelIds.length > 0) {
-			// ミュートしてるチャンネルは含めない
 			query.andWhere(new Brackets(qb => {
 				qb
-					.andWhere('note.channelId NOT IN (:...mutingChannelIds)', { mutingChannelIds })
-					.andWhere('note.renoteChannelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+					// ミュートしてるチャンネルは含めない
+					.where(new Brackets(qb2 => {
+						qb2
+							.andWhere(new Brackets(qb3 => {
+								qb3
+									.andWhere('note.channelId IS NOT NULL')
+									.andWhere('note.channelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+							}))
+							.andWhere(new Brackets(qb3 => {
+								qb3
+									.andWhere('note.renoteChannelId IS NOT NULL')
+									.andWhere('note.renoteChannelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+							}));
+					}))
+					// チャンネルの投稿ではない
+					.orWhere('note.channelId IS NULL');
 			}));
 		}
 
diff --git a/packages/backend/src/server/api/endpoints/notes/timeline.ts b/packages/backend/src/server/api/endpoints/notes/timeline.ts
index 9fa9abc903..38b27da1ed 100644
--- a/packages/backend/src/server/api/endpoints/notes/timeline.ts
+++ b/packages/backend/src/server/api/endpoints/notes/timeline.ts
@@ -149,9 +149,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 				followerId: me.id,
 			},
 		});
-		const mutingChannelIds = (followingChannels.length > 0)
-			? await this.channelMutingService.list({ requestUserId: me.id }).then(x => x.map(x => x.id))
-			: [];
+		const mutingChannelIds = await this.channelMutingService.list({ requestUserId: me.id }).then(x => x.map(x => x.id));
 
 		//#region Construct query
 		const query = this.queryService.makePaginationQuery(this.notesRepository.createQueryBuilder('note'), ps.sinceId, ps.untilId)
@@ -200,11 +198,24 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 		}
 
 		if (mutingChannelIds.length > 0) {
-			// ミュートしてるチャンネルは含めない
 			query.andWhere(new Brackets(qb => {
 				qb
-					.andWhere('note.channelId NOT IN (:...mutingChannelIds)', { mutingChannelIds })
-					.andWhere('note.renoteChannelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+					// ミュートしてるチャンネルは含めない
+					.where(new Brackets(qb2 => {
+						qb2
+							.andWhere(new Brackets(qb3 => {
+								qb3
+									.andWhere('note.channelId IS NOT NULL')
+									.andWhere('note.channelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+							}))
+							.andWhere(new Brackets(qb3 => {
+								qb3
+									.andWhere('note.renoteChannelId IS NOT NULL')
+									.andWhere('note.renoteChannelId NOT IN (:...mutingChannelIds)', { mutingChannelIds });
+							}));
+					}))
+					// チャンネルの投稿ではない
+					.orWhere('note.channelId IS NULL');
 			}));
 		}