diff --git a/src/core/util/env.js b/src/core/util/env.js
index 07cadd9cf9a..a79cb8d5333 100644
--- a/src/core/util/env.js
+++ b/src/core/util/env.js
@@ -41,7 +41,7 @@ export const isServerRendering = () => {
     if (!inBrowser && !inWeex && typeof global !== 'undefined') {
       // detect presence of vue-server-renderer and avoid
       // Webpack shimming the process
-      _isServer = global['process'].env.VUE_ENV === 'server'
+      _isServer = global['process'] && global['process'].env.VUE_ENV === 'server'
     } else {
       _isServer = false
     }