Fix #7431 (#7432)

* Fix #7431

* fix

src/remote/activitypub/kernel/like.ts

@@ -11,6 +11,11 @@ export default async (actor: IRemoteUser, activity: ILike) => {
 
 	await extractEmojis(activity.tag || [], actor.host).catch(() => null);
 
-	await create(actor, note, activity._misskey_reaction || activity.content || activity.name);
-	return `ok`;
+	return await create(actor, note, activity._misskey_reaction || activity.content || activity.name).catch(e => {
+		if (e.id === '51c42bb4-931a-456b-bff7-e5a8a70dd298') {
+			return 'skip: already reacted';
+		} else {
+			throw e;
+		}
+	}).then(() => 'ok');
 };