From 9d31b6ffa853596b56264c89a65fab9d4ad18b73 Mon Sep 17 00:00:00 2001
From: Jy <1041207253@qq.com>
Date: Sun, 29 Mar 2020 16:49:11 +0800
Subject: [PATCH 1/2] fix: defaultActiveFirstOption is true and activeKey is
 Falsy will return the next child key #1727

---
 components/vc-menu/SubPopupMenu.jsx | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/components/vc-menu/SubPopupMenu.jsx b/components/vc-menu/SubPopupMenu.jsx
index 8aa8d10d43..a964182ca1 100644
--- a/components/vc-menu/SubPopupMenu.jsx
+++ b/components/vc-menu/SubPopupMenu.jsx
@@ -65,7 +65,7 @@ export function getActiveKey(props, originalActiveKey) {
   if (defaultActiveFirst) {
     loopMenuItem(children, (c, i) => {
       const propsData = c.componentOptions.propsData || {};
-      if (!activeKey && c && !propsData.disabled) {
+      if (activeKey === null && c && !propsData.disabled) {
         activeKey = getKeyFromChildrenIndex(c, eventKey, i);
       }
     });

From e9e4ba7dbe068b3663adf2c9a15447ada814e72f Mon Sep 17 00:00:00 2001
From: Jy <1041207253@qq.com>
Date: Thu, 2 Apr 2020 21:24:50 +0800
Subject: [PATCH 2/2] fix: defaultActiveFirstOption is true and activeKey is
 undefined #1727

---
 components/vc-menu/SubPopupMenu.jsx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/components/vc-menu/SubPopupMenu.jsx b/components/vc-menu/SubPopupMenu.jsx
index a964182ca1..d101a7dd60 100644
--- a/components/vc-menu/SubPopupMenu.jsx
+++ b/components/vc-menu/SubPopupMenu.jsx
@@ -65,7 +65,8 @@ export function getActiveKey(props, originalActiveKey) {
   if (defaultActiveFirst) {
     loopMenuItem(children, (c, i) => {
       const propsData = c.componentOptions.propsData || {};
-      if (activeKey === null && c && !propsData.disabled) {
+      const noActiveKey = activeKey === null || activeKey === undefined;
+      if (noActiveKey && c && !propsData.disabled) {
         activeKey = getKeyFromChildrenIndex(c, eventKey, i);
       }
     });