From 4e270e187389e02e8feeb15c55a324c917014d6c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=BA=8C=E8=B4=A7=E6=9C=BA=E5=99=A8=E4=BA=BA?=
 <smith3816@gmail.com>
Date: Sun, 22 Mar 2020 11:18:35 +0800
Subject: [PATCH] fix: null value tooltip (#22482)

---
 components/slider/__tests__/index.test.js | 6 ++++++
 components/slider/index.tsx               | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/components/slider/__tests__/index.test.js b/components/slider/__tests__/index.test.js
index 17e7ffa827..504346a09e 100644
--- a/components/slider/__tests__/index.test.js
+++ b/components/slider/__tests__/index.test.js
@@ -87,4 +87,10 @@ describe('Slider', () => {
     await sleep(20);
     expect(wrapper.find('Tooltip').instance().tooltip.forcePopupAlign).toHaveBeenCalled();
   });
+
+  it('tipFormatter should not crash with undefined value', () => {
+    [undefined, null].forEach(value => {
+      mount(<Slider value={value} tooltipVisible />);
+    });
+  });
 });
diff --git a/components/slider/index.tsx b/components/slider/index.tsx
index 1c7248f7bd..d0d905d862 100644
--- a/components/slider/index.tsx
+++ b/components/slider/index.tsx
@@ -64,7 +64,7 @@ export interface SliderState {
 export default class Slider extends React.Component<SliderProps, SliderState> {
   static defaultProps = {
     tipFormatter(value: number) {
-      return value.toString();
+      return typeof value === 'number' ? value.toString() : '';
     },
   };