diff --git a/src/Animate.js b/src/Animate.js
index 9ae8a3a..34843b5 100644
--- a/src/Animate.js
+++ b/src/Animate.js
@@ -5,7 +5,7 @@ import {
   findShownChildInChildrenByKey,
   findChildInChildrenByKey,
   isSameChildren,
-} from './ChildrenUtils';
+  } from './ChildrenUtils';
 import AnimateChild from './AnimateChild';
 const defaultKey = 'rc_animate_' + Date.now();
 import animUtil from './util';
@@ -271,8 +271,8 @@ const Animate = React.createClass({
     let children = null;
     if (stateChildren) {
       children = stateChildren.map((child) => {
-        if (!child.key) {
-          throw new Error('must set key for <rc-animate> children');
+        if (!child || !child.key) {
+          return child;
         }
         return (<AnimateChild
           key={child.key}