From 30f72420e273df5efc2829b9f10064a1bdeadad0 Mon Sep 17 00:00:00 2001
From: Haoqun Jiang <haoqunjiang@gmail.com>
Date: Fri, 8 Nov 2019 22:03:37 +0800
Subject: [PATCH] fix: `vue add` should not crash when executed under Yarn PnP

TODO: should fix `loadModule` in PnP environment
---
 packages/@vue/cli/lib/add.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/@vue/cli/lib/add.js b/packages/@vue/cli/lib/add.js
index a2a3368013..d00afb2e12 100644
--- a/packages/@vue/cli/lib/add.js
+++ b/packages/@vue/cli/lib/add.js
@@ -20,7 +20,7 @@ async function add (pluginName, options = {}, context = process.cwd()) {
 
   // for `vue add` command in 3.x projects
   const servicePkg = loadModule('@vue/cli-service/package.json', context)
-  if (semver.satisfies(servicePkg.version, '3.x')) {
+  if (servicePkg && semver.satisfies(servicePkg.version, '3.x')) {
     // special internal "plugins"
     if (/^(@vue\/)?router$/.test(pluginName)) {
       return addRouter(context)