From 6124ce3251e8718c4c02d0b9cb0ed053f9be2598 Mon Sep 17 00:00:00 2001
From: Yosuke Furukawa <yosuke.furukawa@gmail.com>
Date: Sat, 23 Nov 2019 11:07:30 +0900
Subject: [PATCH] Update packages/next/server/next-dev-server.ts

Co-Authored-By: Tim Neutkens <tim@timneutkens.nl>
---
 packages/next/server/next-dev-server.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/next/server/next-dev-server.ts b/packages/next/server/next-dev-server.ts
index b08e316acd890..799fd3d9e2448 100644
--- a/packages/next/server/next-dev-server.ts
+++ b/packages/next/server/next-dev-server.ts
@@ -54,7 +54,7 @@ export default class DevServer extends Server {
       html: string,
       pathname: string
     ) => {
-      const validatorPath = this.nextConfig.amp && this.nextConfig.amp.validator
+      const validatorPath = this.nextConfig.experimental && this.nextConfig.experimental.amp && this.nextConfig.experimental.amp.validator
       return AmpHtmlValidator.getInstance(validatorPath).then(validator => {
         const result = validator.validateString(html)
         ampValidation(