From dfbb59616a6cc2f036c8361ca4c30fcb471a5eef Mon Sep 17 00:00:00 2001
From: Ulion <ulion2002@gmail.com>
Date: Sun, 7 Feb 2021 12:55:42 +0800
Subject: [PATCH] Fix undefined caused toJS failure.

---
 packages/bridge/src/utils/index.ts | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/packages/bridge/src/utils/index.ts b/packages/bridge/src/utils/index.ts
index 137a2c4..da1257f 100644
--- a/packages/bridge/src/utils/index.ts
+++ b/packages/bridge/src/utils/index.ts
@@ -6,6 +6,9 @@ import { CollabAction } from '../model'
 export * from './testUtils'
 
 const toJS = (node: any) => {
+  if (node === undefined) {
+    return undefined
+  }
   try {
     return JSON.parse(JSON.stringify(node))
   } catch (e) {