From bc7dd93f9223e8c5809ad7b95fcf8b2414181b91 Mon Sep 17 00:00:00 2001
From: hfutsora <31959015+Hfutsora@users.noreply.github.com>
Date: Mon, 2 Aug 2021 21:41:41 +0800
Subject: [PATCH] fix(runtime-dom): fix shadowRoot instanceof check in
 unsupported browsers (#4238)

---
 packages/runtime-dom/src/index.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/packages/runtime-dom/src/index.ts b/packages/runtime-dom/src/index.ts
index f6f0cf322..ed35e1293 100644
--- a/packages/runtime-dom/src/index.ts
+++ b/packages/runtime-dom/src/index.ts
@@ -184,6 +184,7 @@ function normalizeContainer(
   }
   if (
     __DEV__ &&
+    window.ShadowRoot &&
     container instanceof window.ShadowRoot &&
     container.mode === 'closed'
   ) {