开发工具抛出一个错误!这是什么原因,无从查找,谁给看看?

VM30:1 TypeError: Cannot read property ‘elem’ of undefined

    at M (VM46 WAService.js:2)

    at VM46 WAService.js:2

    at VM46 WAService.js:2

    at n (VM44 asdebug.js:1)

    at e.exports.<anonymous> (VM44 asdebug.js:1)

    at VM44 asdebug.js:1

    at Array.forEach (<anonymous>)

    at WebSocket._ws.onmessage (VM44 asdebug.js:1)