diff --git a/packages/backend/src/core/NotificationService.ts b/packages/backend/src/core/NotificationService.ts
index 65d7beb442..c3b9c8163b 100644
--- a/packages/backend/src/core/NotificationService.ts
+++ b/packages/backend/src/core/NotificationService.ts
@@ -109,7 +109,7 @@ export class NotificationService implements OnApplicationShutdown {
 
 			const mutings = await this.cacheService.userMutingsCache.fetch(notifieeId);
 			const muting = mutings.get(notifierId);
-			if (muting && muting.mutingType === 'all') {
+			if (muting != null && muting.mutingType === 'all') {
 				return null;
 			}
 
diff --git a/packages/backend/src/core/entities/NotificationEntityService.ts b/packages/backend/src/core/entities/NotificationEntityService.ts
index bada10c4f4..7e210215e5 100644
--- a/packages/backend/src/core/entities/NotificationEntityService.ts
+++ b/packages/backend/src/core/entities/NotificationEntityService.ts
@@ -295,7 +295,7 @@ export class NotificationEntityService implements OnModuleInit {
 	): boolean {
 		if (!('notifierId' in notification)) return true;
 		const muting = userIdsWhoMeMutingMap.get(notification.notifierId);
-		if (muting && muting.mutingType === 'all') return false;
+		if (muting != null && muting.mutingType === 'all') return false;
 
 		const notifier = notifiers.find(x => x.id === notification.notifierId) ?? null;