diff --git a/src/shared/mixin.js b/src/shared/mixin.js
index e39aac51..3a81967e 100644
--- a/src/shared/mixin.js
+++ b/src/shared/mixin.js
@@ -21,6 +21,8 @@ export default function createMixin (Vue, options) {
       const $root = this[rootKey]
       const $options = this.$options
       const devtoolsEnabled = Vue.config.devtools
+      
+      $root[rootConfigKey] = {}
 
       Object.defineProperty(this, '_hasMetaInfo', {
         configurable: true,