diff --git a/src/services/note/reaction/create.ts b/src/services/note/reaction/create.ts
index adc96ddc1f..8de9f53a17 100644
--- a/src/services/note/reaction/create.ts
+++ b/src/services/note/reaction/create.ts
@@ -11,33 +11,40 @@ import { perUserReactionsChart } from '../../chart';
 import { genId } from '../../../misc/gen-id';
 import { createNotification } from '../../create-notification';
 import deleteReaction from './delete';
+import { isDuplicateKeyValueError } from '../../../misc/is-duplicate-key-value-error';
 
 export default async (user: User, note: Note, reaction?: string) => {
 	reaction = await toDbReaction(reaction, user.host);
 
-	const exist = await NoteReactions.findOne({
-		noteId: note.id,
-		userId: user.id,
-	});
-
-	if (exist) {
-		if (exist.reaction !== reaction) {
-			// 別のリアクションがすでにされていたら置き換える
-			await deleteReaction(user, note);
-		} else {
-			// 同じリアクションがすでにされていたら何もしない
-			return;
-		}
-	}
+	let record;
 
 	// Create reaction
-	const inserted = await NoteReactions.save({
-		id: genId(),
-		createdAt: new Date(),
-		noteId: note.id,
-		userId: user.id,
-		reaction
-	});
+	try {
+		record = await NoteReactions.save({
+			id: genId(),
+			createdAt: new Date(),
+			noteId: note.id,
+			userId: user.id,
+			reaction
+		});
+	} catch (e) {
+		if (isDuplicateKeyValueError(e)) {
+			record = await NoteReactions.findOneOrFail({
+				noteId: note.id,
+				userId: user.id,
+			});
+
+			if (record.reaction !== reaction) {
+				// 別のリアクションがすでにされていたら置き換える
+				await deleteReaction(user, note);
+			} else {
+				// 同じリアクションがすでにされていたら何もしない
+				return;
+			}
+		} else {
+			throw e;
+		}
+	}
 
 	// Increment reactions count
 	const sql = `jsonb_set("reactions", '{${reaction}}', (COALESCE("reactions"->>'${reaction}', '0')::int + 1)::text::jsonb)`;
@@ -101,7 +108,7 @@ export default async (user: User, note: Note, reaction?: string) => {
 
 	//#region 配信
 	if (Users.isLocalUser(user) && !note.localOnly) {
-		const content = renderActivity(await renderLike(inserted, note));
+		const content = renderActivity(await renderLike(record, note));
 		const dm = new DeliverManager(user, content);
 		if (note.userHost !== null) {
 			const reactee = await Users.findOne(note.userId);