请问一个自定义组件在点击之后，出现这个错误是什么原因？

组件有嵌套子组件

以下是错误信息：

webviewScriptError

Cannot read property ‘offsetLeft’ of undefined;[Exparser] [Error] [Component] Event Listener Error @ wx-view#(anonymous)

TypeError: Cannot read property ‘offsetLeft’ of undefined

    at v (http://127.0.0.1:60463/__pageframe__/__dev__/WAWebview.js:19:30697)

    at o.t.(anonymous function).(anonymous function).t.addListener.capture (http://127.0.0.1:60463/__pageframe__/__dev__/WAWebview.js:19:31817)

    at r.safeCallback (http://127.0.0.1:60463/__pageframe__/__dev__/WAWebview.js:5:28055)

    at r.call (http://127.0.0.1:60463/__pageframe__/__dev__/WAWebview.js:5:27819)

    at n (http://127.0.0.1:60463/__pageframe__/__dev__/WAWebview.js:5:30285)

    at http://127.0.0.1:60463/__pageframe__/__dev__/WAWebview.js:5:30839

    at s (http://127.0.0.1:60463/__pageframe__/__dev__/WAWebview.js:5:29853)

    at Function.r.dispatchEvent (http://127.0.0.1:60463/__pageframe__/__dev__/WAWebview.js:5:30740)

    at t (http://127.0.0.1:60463/__pageframe__/__dev__/WAWebview.js:7:24206)

    at g (http://127.0.0.1:60463/__pageframe__/__dev__/WAWebview.js:7:24691)