diff --git a/packages/backend/src/core/activitypub/models/ApNoteService.ts b/packages/backend/src/core/activitypub/models/ApNoteService.ts
index acfab3aadc..2c8d04e480 100644
--- a/packages/backend/src/core/activitypub/models/ApNoteService.ts
+++ b/packages/backend/src/core/activitypub/models/ApNoteService.ts
@@ -201,7 +201,7 @@ export class ApNoteService {
 				| { status: 'ok'; res: Note }
 				| { status: 'permerror' | 'temperror' }
 			> => {
-				if (typeof uri !== 'string' || !uri.match(/^https?:/)) return { status: 'permerror' };
+				if (!uri.match(/^https?:/)) return { status: 'permerror' };
 				try {
 					const res = await this.resolveNote(uri);
 					if (res) {