From e7e1314cccd1a66fcf8b8526ec21350ec16cc3ad Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Mon, 9 Dec 2019 14:23:01 -0500
Subject: [PATCH] test: fix warning

---
 packages/runtime-core/src/apiApp.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/runtime-core/src/apiApp.ts b/packages/runtime-core/src/apiApp.ts
index 71b75821..53614ca2 100644
--- a/packages/runtime-core/src/apiApp.ts
+++ b/packages/runtime-core/src/apiApp.ts
@@ -166,7 +166,7 @@ export function createAppAPI<HostNode, HostElement>(
         rootProps?: Data | null
       ): any {
         if (!isMounted) {
-          if (!isObject(rootProps)) {
+          if (rootProps != null && !isObject(rootProps)) {
             __DEV__ &&
               warn(`root props passed to app.mount() must be an object.`)
             rootProps = null