[Codesandbox demo](https://codesandbox.io/s/react-combo-select-click-bug-ze76q) Clicking on the arrow down icon does nothing. An error occurred in the console. <img width="862" alt="Screen Shot 2019-08-19 at 11 09 46 AM" src="https://user-images.githubusercontent.com/2924390/63281249-e6c0d180-c271-11e9-9539-89f3861252ce.png">
