diff --git a/src/models/favorite.ts b/src/models/favorite.ts
index 2c07959be..2c10674bc 100644
--- a/src/models/favorite.ts
+++ b/src/models/favorite.ts
@@ -79,7 +79,7 @@ export const pack = (
 
 	// (データベースの不具合などで)投稿が見つからなかったら
 	if (_favorite.note == null) {
-		console.warn(`favorite: note not found on database: ${_favorite.noteId}`);
+		console.warn(`in packaging favorite: note not found on database: ${_favorite.noteId}`);
 		return resolve(null);
 	}
 
diff --git a/src/models/notification.ts b/src/models/notification.ts
index 835c89cd5..57be4bef1 100644
--- a/src/models/notification.ts
+++ b/src/models/notification.ts
@@ -77,6 +77,12 @@ export async function deleteNotification(notification: string | mongo.ObjectID |
 	});
 }
 
+export const packMany = async (
+	notifications: any[]
+) => {
+	return (await Promise.all(notifications.map(n => pack(n)))).filter(x => x != null);
+};
+
 /**
  * Pack a notification for API response
  */
@@ -123,6 +129,12 @@ export const pack = (notification: any) => new Promise<any>(async (resolve, reje
 		case 'poll_vote':
 			// Populate note
 			_notification.note = await packNote(_notification.noteId, me);
+
+			// (データベースの不具合などで)投稿が見つからなかったら
+			if (_notification.note == null) {
+				console.warn(`in packaging notification: note not found on database: ${_notification.noteId}`);
+				return resolve(null);
+			}
 			break;
 		default:
 			console.error(`Unknown type: ${_notification.type}`);
diff --git a/src/server/api/endpoints/i/notifications.ts b/src/server/api/endpoints/i/notifications.ts
index 46242b9d9..5cc836e36 100644
--- a/src/server/api/endpoints/i/notifications.ts
+++ b/src/server/api/endpoints/i/notifications.ts
@@ -1,7 +1,7 @@
 import $ from 'cafy'; import ID from '../../../../misc/cafy-id';
 import Notification from '../../../../models/notification';
 import Mute from '../../../../models/mute';
-import { pack } from '../../../../models/notification';
+import { packMany } from '../../../../models/notification';
 import { getFriendIds } from '../../common/get-friends';
 import read from '../../common/read-notification';
 import { ILocalUser } from '../../../../models/user';
@@ -83,7 +83,7 @@ export default (params: any, user: ILocalUser) => new Promise(async (res, rej) =
 		});
 
 	// Serialize
-	res(await Promise.all(notifications.map(notification => pack(notification))));
+	res(await packMany(notifications));
 
 	// Mark all as read
 	if (notifications.length > 0 && markAsRead) {