Calling `ReactDOMServer.renderToStaticMarkup(elementWithPortal);` gets stuck in a loop while trying to do a static render.

Current behavior:
The behavior can be seen here: https://codepen.io/anon/pen/BmqWOM  by un-commenting line 58 (warning: this will make your tab freeze)

Expected behavior:
It should return with results or throw some kind of error if the input is not valid

if (props.value != null) {
          value = props.value + '';
        } else {
          value = optionChildren;
        }
        selected = false;
        if (Array.isArray(selectValue)) {
          
          for (var j = 0; j < selectValue.length; j++) {
            if ('' + selectValue[j] === value) {
              selected = true;
              break;
            }
          }
        } else {
          selected = '' + selectValue === value;
        }
        props = Object.assign(
          {
            selected: undefined,
            children: undefined,
          },
          props,
          {
            selected: selected,
            children: optionChildren,
          },
        );