Cannot read property ‘webviewId’ of undefined 这是出了什么问题？

错误代码：

jsEnginScriptError
Cannot read property ‘webviewId’ of undefined
TypeError: Cannot read property ‘webviewId’ of undefined
    at B (http://1874872866.appservice.open.weixin.qq.com/WAService.js:8:19504)
    at j (http://1874872866.appservice.open.weixin.qq.com/WAService.js:8:20131)
    at .<anonymous> (http://1874872866.appservice.open.weixin.qq.com/WAService.js:8:22039)
    at http://1874872866.appservice.open.weixin.qq.com/WAService.js:8:26882
    at http://1874872866.appservice.open.weixin.qq.com/WAService.js:4:9686
    at Array.forEach (native)
    at .<anonymous> (http://1874872866.appservice.open.weixin.qq.com/WAService.js:4:9666)
    at http://1874872866.appservice.open.weixin.qq.com/WAService.js:4:21083
    at n.<anonymous> (http://1874872866.appservice.open.weixin.qq.com/asdebug.js:1:12545)
    at n.emit (http://1874872866.appservice.open.weixin.qq.com/asdebug.js:1:8747)