VUE+element UI ：TypeError: Cannot read properties of null (reading ‘setAttribute‘)

报错代码：

element-ui.common.js?ccbf:2432

Uncaught TypeError: Cannot read properties of null (reading 'setAttribute')
    at VueComponent.removeTabindex (element-ui.common.js?ccbf:2432:1)
    at VueComponent.hide (element-ui.common.js?ccbf:2358:1)
    at Object.eval [as documentHandler] (clickoutside.js?2126:39:1)
    at eval (clickoutside.js?2126:25:1)
    at Array.forEach ()

    at HTMLDocument.eval (clickoutside.js?2126:24:1)

报错原因：

疑似，ElCollapseItem组件的父组件ElCollapse在封装的组件内部

解决方案：