undefined 'this.patchIndexes.length' - WXOPEN Club

SDKVersion 1.9.0

brand iPhone

model iPhone 6s<iPhone8,1>

system iOS 11.2.1

version 6.6.1

目前还不知如何复现，小程序正常使用情况下，有机率发生如下错误:

exparserScriptError value@https: undefined is not an object (evaluating 'this.patchIndexes.length')

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:19:12569 value

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:19:293 value

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:7:920

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:6:8219 doUpdates

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:19:7112 applyProperties

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:19:2835 value

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:19:2913

[native code] forEach

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:19:2886 value

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:18:31496 value

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:7:1043 _advancedCreate

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:7:2086 create

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:19:2114 value

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:19:2913

[native code] forEach

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:19:2886 value

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:18:31496 value

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:7:1043 _advancedCreate

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:7:2086 create

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:18:27023 L

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:18:16827 value

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:17:27826 value

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:19:19222 h

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:19:20624 f

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:19:19827

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:19:24321

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:4:24866

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:5:5015 emit

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:5:26854

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:5:12851

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:2:2174 x

https://servicewechat.com/wxb80108bc52854112/14/page-frame.html:1:72 global code

发生在内核程式库

a = function() {

function e(t, n) {

r(this, e), this.oldTree = t, this.patches = n, this.patchIndexes = Object.keys(this.patches).map(function(e) {

return Number(e)

})

}

return o(e, [{

key: "apply",

value: function(e) {

var t = this;

if (0 === this.patchIndexes.length) return e;

var n = (0, i.getDomIndex)(e, this.oldTree, this.patchIndexes);

return this.patchIndexes.forEach(function(e) {

var r = n[e];

if (r) {

t.patches[e].forEach(function(e) {

e.apply(r)

})

}

}), e

}

}]), e

}();

看似不明原因，this.patchIndexes.length 之 this.patchIndexes 是 undefined

请问要如何避免这个错误，谢谢