diff --git a/CHANGELOG.md b/CHANGELOG.md
index ed3c274e..0f87355f 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 1.2.6 - 25 Dec 2024
+Bug fix:
+- mapResponse with onError caused compilation error
+
 # 1.2.5 - 25 Dec 2024
 Bug fix:
 - define universal/file in package export
diff --git a/example/a.ts b/example/a.ts
index f139598e..4e6e06a4 100644
--- a/example/a.ts
+++ b/example/a.ts
@@ -2,14 +2,18 @@ import { Elysia, file, getSchemaValidator, t } from '../src'
 import { post, req } from '../test/utils'
 
 const app = new Elysia()
-	.get('/image', async () => {
-		return file('test/kyuukurarin.mp4')
+	.onError(() => {})
+	.mapResponse(() => {
+		if (Math.random() > 2) return new Response('error', { status: 500 })
+	})
+	.get('/', async () => {
+		return 'ok'
 	})
 	.listen(3000)
 
 // console.log(app.routes[0].compile().toString())
 
-// app.handle(req('/'))
+app.handle(req('/')).then(x => x.text()).then(console.log)
 
 // console.log(
 // 	`🦊 Elysia is running at ${app.server?.hostname}:${app.server?.port}`
diff --git a/package.json b/package.json
index a9715934..c73f9e90 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
 	"name": "elysia",
 	"description": "Ergonomic Framework for Human",
-	"version": "1.2.5",
+	"version": "1.2.6",
 	"author": {
 		"name": "saltyAom",
 		"url": "https://github.com/SaltyAom",
diff --git a/src/compose.ts b/src/compose.ts
index 7b2f5814..94ef8819 100644
--- a/src/compose.ts
+++ b/src/compose.ts
@@ -571,7 +571,7 @@ export const composeHandler = ({
 					`c.set.cookie['${name}'].value=await signCookie(_setCookie['${name}'].value,'${secret}')` +
 					'}'
 
-		encodeCookie += '}'
+		encodeCookie += '}\n'
 	}
 
 	const normalize = app.config.normalize
@@ -1706,7 +1706,7 @@ export const composeHandler = ({
 
 					fnLiteral +=
 						`if(mr===undefined){` +
-						`mr=${isAsyncName(mapResponse) ? 'await ' : ''}onMapResponse[${i}](c)` +
+						`mr=${isAsyncName(mapResponse) ? 'await ' : ''}onMapResponse[${i}](c)\n` +
 						`if(mr!==undefined)r=c.response=mr` +
 						`}`
 
@@ -1808,8 +1808,8 @@ export const composeHandler = ({
 
 					fnLiteral +=
 						`c.response=er\n` +
-						`er=${isAsyncName(mapResponse) ? 'await ' : ''}onMapResponse[${i}](c)\n` +
-						`if(er instanceof Promise)er=await er`
+						`er=onMapResponse[${i}](c)\n` +
+						`if(er instanceof Promise)er=await er\n`
 
 					endUnit()
 				}
diff --git a/test/lifecycle/map-response.test.ts b/test/lifecycle/map-response.test.ts
index b13863b6..8445bcc4 100644
--- a/test/lifecycle/map-response.test.ts
+++ b/test/lifecycle/map-response.test.ts
@@ -272,4 +272,15 @@ describe('Map Response', () => {
 
 		expect(response).toBe('aru')
 	})
+
+	it('mapResponse with onError', async () => {
+		const app = new Elysia()
+			.onError(() => {})
+			.mapResponse(() => {})
+			.get('/', () => 'ok')
+
+		const response = await app.handle(req('/')).then((x) => x.text())
+
+		expect(response).toBe('ok')
+	})
 })