diff --git a/packages/backend/src/remote/activitypub/audience.ts b/packages/backend/src/remote/activitypub/audience.ts
index 36c988eff..380f1a4db 100644
--- a/packages/backend/src/remote/activitypub/audience.ts
+++ b/packages/backend/src/remote/activitypub/audience.ts
@@ -1,6 +1,6 @@
 import type { ApObject } from "./type.js";
 import { getApIds } from "./type.js";
-import type Resolver from "./resolver.js";
+import Resolver from "./resolver.js";
 import { resolvePerson } from "./models/person.js";
 import { unique, concat } from "@/prelude/array.js";
 import promiseLimit from "promise-limit";
@@ -31,6 +31,7 @@ export async function parseAudience(
 
 	const others = unique(concat([toGroups.other, ccGroups.other]));
 
+	resolver ??= new Resolver();
 	const limit = promiseLimit<CacheableUser | null>(2);
 	const mentionedUsers = (
 		await Promise.all(