自定义组件内的button 如何触发页面的分享

分享报错：

TypeError: Cannot convert undefined or null to object

    at n.keys (<anonymous>)

    at http://127.0.0.1:37830/appservice/\_\_dev\_\_/WAService.js:1:15580

    at e.(anonymous function) (http://127.0.0.1:37830/appservice/\_\_dev\_\_/WAService.js:6:11129)

    at a (http://127.0.0.1:37830/appservice/appservice?t=1533285396089:1778:9472)

    at e.registerCallback (http://127.0.0.1:37830/appservice/appservice?t=1533285396089:1778:9659)

    at m.forEach (http://127.0.0.1:37830/appservice/appservice?t=1533285396089:1778:1513)

    at Array.forEach (<anonymous>)

    at d (http://127.0.0.1:37830/appservice/appservice?t=1533285396089:1778:1493)

    at WebSocket.j.onmessage (http://127.0.0.1:37830/appservice/appservice?t=1533285396089:1778:1386)

请问是什么原因？

你好，问题未复现。请提供一下出现问题的机型和微信版本，以及能复现问题的简单代码片段（https://developers.weixin.qq.com/miniprogram/dev/devtools/minicode.html）。

<button  open-type = share></button>