什么爬虫？一直爬页面，报一些莫名的错，没人了吗，官方的人呢 可以来解释一下吗

具体报错内容样本如下

webviewScriptError

Cannot read property '_formId' of undefined;[Exparser] [Error] [Component] Event Listener Error @ wx-button#(anonymous)

TypeError: Cannot read property '_formId' of undefined

    at n._onThisTap (WAWebview.js:1:716848)

    at n.<anonymous> (WAWebview.js:1:232673)

    at i.safeCallback (WAWebview.js:1:136171)

    at i.call (WAWebview.js:1:136064)

    at o (WAWebview.js:1:139337)

    at WAWebview.js:1:139949

    at p (WAWebview.js:1:138871)

    at Function.l.dispatchEvent (WAWebview.js:1:139835)

    at Function.l.triggerEvent (WAWebview.js:1:140049)

    at n.m.triggerEvent (WAWebview.js:1:217488)

感觉是微信小程序内部报错而非第三方脚本报错，但并非所有项目都有这个问题，请问什么情况下会引发这种类型的报错