console WAService.js:2 报错?

https://developers.weixin.qq.com/s/JtIZw9mD7sgw

错误提示只有这些，怎么解决？

VM52:1 TypeError: Cannot set property ‘top’ of undefined

    at VM68 WAService.js:2

    at VM68 WAService.js:2

    at n (VM66 asdebug.js:1)

    at e.exports.<anonymous> (VM66 asdebug.js:1)

    at VM66 asdebug.js:1

    at Array.forEach (<anonymous>)

    at WebSocket._ws.onmessage (VM66 asdebug.js:1)