From b6d386b07018830faa2da82176c7b1835d68a980 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Wed, 6 Jul 2016 18:35:51 -0400
Subject: [PATCH] fix getReadlChild types

---
 src/core/vdom/helpers.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/core/vdom/helpers.js b/src/core/vdom/helpers.js
index 709fbb12..9e5769a5 100644
--- a/src/core/vdom/helpers.js
+++ b/src/core/vdom/helpers.js
@@ -64,10 +64,10 @@ function applyNS (vnode, ns) {
 
 // in case the child is also an abstract component, e.g. <transition-control>
 // we want to recrusively retrieve the real component to be rendered
-export function getRealChild (vnode) {
+export function getRealChild (vnode: ?VNode): ?VNode {
   const compOptions = vnode && vnode.componentOptions
   if (compOptions && compOptions.Ctor.options._abstract) {
-    return getRealChild(compOptions.propsData.child)
+    return getRealChild(compOptions.propsData && compOptions.propsData.child)
   } else {
     return vnode
   }