From 44ad6b0c07815af694c76b327f44f37191a2a9d9 Mon Sep 17 00:00:00 2001
From: wangxing <wangxing@nroad.com.cn>
Date: Thu, 28 Mar 2019 17:04:26 +0800
Subject: [PATCH] fix-15699

---
 components/menu/index.tsx | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/components/menu/index.tsx b/components/menu/index.tsx
index ab4500ce14..41cfbdd2b3 100644
--- a/components/menu/index.tsx
+++ b/components/menu/index.tsx
@@ -171,10 +171,12 @@ class Menu extends React.Component<MenuProps, MenuState> {
     // when inlineCollapsed menu width animation finished
     // https://github.com/ant-design/ant-design/issues/12864
     const widthCollapsed = e.propertyName === 'width' && e.target === e.currentTarget;
+    // Fix e.target.className.indexOf is not a function
+    // https://github.com/ant-design/ant-design/issues/15699
+    const { className = '' } = e.target as HTMLElement;
     // Fix for <Menu style={{ width: '100%' }} />, the width transition won't trigger when menu is collapsed
     // https://github.com/ant-design/ant-design-pro/issues/2783
-    const iconScaled =
-      e.propertyName === 'font-size' && (e.target as HTMLElement).className.indexOf('anticon') >= 0;
+    const iconScaled = e.propertyName === 'font-size' && className.indexOf('anticon') >= 0;
     if (widthCollapsed || iconScaled) {
       this.restoreModeVerticalFromInline();
     }