From 9cf75258c866bbdb2023c066cc3579fb86f15f40 Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Tue, 30 Mar 2021 19:55:05 -0400
Subject: [PATCH] fix(runtime-core): fix dev fragment root flag check

---
 packages/runtime-core/src/renderer.ts | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/packages/runtime-core/src/renderer.ts b/packages/runtime-core/src/renderer.ts
index 5122e7a91..15f86faa4 100644
--- a/packages/runtime-core/src/renderer.ts
+++ b/packages/runtime-core/src/renderer.ts
@@ -848,7 +848,11 @@ function baseCreateRenderer(
     }
     if (parentComponent) {
       let subTree = parentComponent.subTree
-      if (__DEV__ && subTree.patchFlag & PatchFlags.DEV_ROOT_FRAGMENT) {
+      if (
+        __DEV__ &&
+        subTree.patchFlag > 0 &&
+        subTree.patchFlag & PatchFlags.DEV_ROOT_FRAGMENT
+      ) {
         subTree =
           filterSingleRoot(subTree.children as VNodeArrayChildren) || subTree
       }