ntree filter search - Cannot read properties of undefined (reading 'toLowerCase')

[clabnet]

TuSimple/naive-ui version (版本)

2.29.0

Vue version (Vue 版本)

3.2.34-beta.1

Browser and its version (浏览器及其版本)

Chrome Version 101.0.4951.54 (Official Build) (64-bit)

System and its version (系统及其版本)

Windows 10 pro en

Node version (Node 版本)

16.14.0

Reappearance link (重现链接)

https://codesandbox.io/s/ntree-filter-issue-naive-ui-36d8k3

Reappearance steps (重现步骤)

The issue is related to https://www.naiveui.com/en-US/os-theme/components/tree page,
Search . Tree accept pattern and filter to do searching.
The codesandbox was forked from your sample. Only difference is the data values.
When I try to search a string, the issue happen "Cannot read properties of undefined (reading 'toLowerCase')".

Expected results (期望的结果)

Filter data with search input value

Actual results (实际的结果)

Cannot read properties of undefined (reading 'toLowerCase')

Remarks (补充说明)