[Bug Report] Chrome will crash when set Table Component 'thead' css 'display' to none

[ustbhuangyi]

Element UI version

2.10.1

OS/Browsers version

MacOS 10.13.6 / Google Chrome Version 75.0.3770.100 (Official Build) (64-bit)

Vue version

2.6.10

Reproduction Link

https://codepen.io/pen >> https://element.eleme.io/#/zh-CN/component/table

Steps to reproduce

1. Open chrome dev tools
2. Find any element of thead.
3. Add 'display:none' rule for the '.el-table thead' selector.
4. Then Chrome crashed.

PS. The issue link rule is bypassed, because links on official websites can reproduce this problem very well.
The reproduction link is https://element.eleme.io/#/zh-CN/component/table

What is Expected?

Chrome won't crash,and the table header can be hidden.

What is actually happening?

Chrome crashed.

[wkl007]

Yes, I have the same problem.