收集到iPhone6上报错，appId为wx4f9ba4a4e2731d4e。 请问这是什么原因引起的？本地无法复现。

解决了，这个是微信爬虫引起的。估计是爬虫引擎有缺陷。

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:1:716849) at n.<anonymous> (WAWebview.js:1:232674) at i.safeCallback (WAWebview.js:1:136172) at i.call (WAWebview.js:1:136065) at o (WAWebview.js:1:139338) at WAWebview.js:1:139950 at p (WAWebview.js:1:138872) at Function.l.dispatchEvent (WAWebview.js:1:139836) at Function.l.triggerEvent (WAWebview.js:1:140050) at n.m.triggerEvent (WAWebview.js:1:217489)