diff --git a/packages/backend/src/core/activitypub/ApDbResolverService.ts b/packages/backend/src/core/activitypub/ApDbResolverService.ts
index 2cb558dbff..12e58efdc2 100644
--- a/packages/backend/src/core/activitypub/ApDbResolverService.ts
+++ b/packages/backend/src/core/activitypub/ApDbResolverService.ts
@@ -176,9 +176,7 @@ export class ApDbResolverService implements OnApplicationShutdown {
 	public async refetchPublicKeyForApId(user: MiRemoteUser): Promise<MiUserPublickey | null> {
 		await this.apPersonService.updatePerson(user.uri);
 		const key = await this.userPublickeysRepository.findOneBy({ userId: user.id });
-		if (key != null) {
-			await this.publicKeyByUserIdCache.set(user.id, key);
-		}
+		this.publicKeyByUserIdCache.set(user.id, key);
 		return key;
 	}