From 339f299ac6e0b52ddabaa82414fcd024a9961bea Mon Sep 17 00:00:00 2001
From: Pooya Parsa <pyapar@gmail.com>
Date: Tue, 16 Mar 2021 14:01:24 +0100
Subject: [PATCH] fix: handle async placeholders in normalizeScopedSlot

---
 src/core/vdom/helpers/normalize-scoped-slots.js | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/src/core/vdom/helpers/normalize-scoped-slots.js b/src/core/vdom/helpers/normalize-scoped-slots.js
index 1e43fd393f7..a5636802b9c 100644
--- a/src/core/vdom/helpers/normalize-scoped-slots.js
+++ b/src/core/vdom/helpers/normalize-scoped-slots.js
@@ -3,6 +3,7 @@
 import { def } from 'core/util/lang'
 import { normalizeChildren } from 'core/vdom/helpers/normalize-children'
 import { emptyObject } from 'shared/util'
+import { isAsyncPlaceholder } from './is-async-placeholder'
 
 export function normalizeScopedSlots (
   slots: { [key: string]: Function } | void,
@@ -60,9 +61,10 @@ function normalizeScopedSlot(normalSlots, key, fn) {
     res = res && typeof res === 'object' && !Array.isArray(res)
       ? [res] // single vnode
       : normalizeChildren(res)
+    let _vnode: VNode = res && res[0]
     return res && (
-      res.length === 0 ||
-      (res.length === 1 && res[0].isComment) // #9658
+      !_vnode ||
+      (_vnode.isComment && !isAsyncPlaceholder(_vnode)) // #9658, #10391
     ) ? undefined
       : res
   }