From 054c2c3de2976c8f87b7a52980bc89c12d3d90ee Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Fri, 15 Apr 2016 15:35:47 -0400
Subject: [PATCH] fix attr merging

---
 src/runtime/instance/render.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/runtime/instance/render.js b/src/runtime/instance/render.js
index 3893e08af..80b17bc1b 100644
--- a/src/runtime/instance/render.js
+++ b/src/runtime/instance/render.js
@@ -42,9 +42,10 @@ function resolveSlots (vm, children) {
 function mergeParentAttrs (vm, data, parentData) {
   if (parentData.attrs) {
     const props = vm.$options.props
+    const attrs = data.attrs || (data.attrs = [])
     for (let key in parentData.attrs) {
       if (!hasOwn(props, key)) {
-        data.attrs[key] = parentData.attrs[key]
+        attrs[key] = parentData.attrs[key]
       }
     }
   }