diff --git a/src/tree/view/tree.jsx b/src/tree/view/tree.jsx
index 2cd6a1d279..b487a745c0 100644
--- a/src/tree/view/tree.jsx
+++ b/src/tree/view/tree.jsx
@@ -748,7 +748,7 @@ class Tree extends Component {
 
     handleBlur(e) {
         this.setState({
-            focusedKey: '',
+            focusedKey: null,
         });
 
         this.props.onBlur && this.props.onBlur(e);