From 838287a16da7f361d56c0676d464b5f74af75bbf Mon Sep 17 00:00:00 2001
From: Olivia Osborn <44754360+olivia-osborn@users.noreply.github.com>
Date: Tue, 3 Aug 2021 01:09:43 -0400
Subject: [PATCH] Removed sn undefined warning (#572)

---
 packages/rrweb/src/utils.ts | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/packages/rrweb/src/utils.ts b/packages/rrweb/src/utils.ts
index fcad16e8..30ba5836 100644
--- a/packages/rrweb/src/utils.ts
+++ b/packages/rrweb/src/utils.ts
@@ -39,7 +39,7 @@ export function createMirror(): Mirror {
     map: {},
     getId(n) {
       // if n is not a serialized INode, use -1 as its id.
-      if (!n.__sn) {
+      if (!n || !n.__sn) {
         return -1;
       }
       return n.__sn.id;