diff --git a/CHANGELOG.md b/CHANGELOG.md
index f6ea16a3ba..b2e90d9403 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -21,7 +21,7 @@
 - PWA時の絵文字ピッカーの位置をホームバーに重ならないように調整
 
 ### Server
--
+- 通知読み込みでエラーが発生する場合がある問題を修正
 
 
 ## 13.11.0
diff --git a/packages/backend/src/core/FederatedInstanceService.ts b/packages/backend/src/core/FederatedInstanceService.ts
index 1d0c87280f..56660ae0d0 100644
--- a/packages/backend/src/core/FederatedInstanceService.ts
+++ b/packages/backend/src/core/FederatedInstanceService.ts
@@ -29,6 +29,7 @@ export class FederatedInstanceService {
 			toRedisConverter: (value) => JSON.stringify(value),
 			fromRedisConverter: (value) => {
 				const parsed = JSON.parse(value);
+				if (parsed == null) return null;
 				return {
 					...parsed,
 					firstRetrievedAt: new Date(parsed.firstRetrievedAt),