From 83f85a371a0defe86bfd30dacf5593ba385f2b91 Mon Sep 17 00:00:00 2001
From: Sebastian Blade <blade254353074@hotmail.com>
Date: Fri, 24 Mar 2017 13:10:27 +0800
Subject: [PATCH] Fix button render with null or undefined child. (#5473)

* Fix button render with null or undefined child.

Fix bug #5472

* Add missing semicolon

* Make if statement braced.

......
---
 components/button/button.tsx | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/components/button/button.tsx b/components/button/button.tsx
index dc2f062a11..2211cad152 100644
--- a/components/button/button.tsx
+++ b/components/button/button.tsx
@@ -12,6 +12,10 @@ function isString(str) {
 
 // Insert one space between two chinese characters automatically.
 function insertSpace(child) {
+  // Check the child if is undefined or null.
+  if (child == null) {
+    return;
+  }
   if (isString(child.type) && isTwoCNChar(child.props.children)) {
     return React.cloneElement(child, {},
                               child.props.children.split('').join(' '));