message: Added a check that a command exists before seeing if it opens a window
diff: @@ -114,7 +114,7 @@ export default class CommandForm extends React.Component {
  <FlatButton
  data-tip="<p>Modify new window configuration</p>"
  className={classNames('icon', 'si-search', {
  - active: this.props.command.opensWindow,
  + active: this.props.command && this.props.command.opensWindow,
  })}
  disabled={!this.props.command || PlaybackState.isPlaying}
  onClick={ModalState.toggleNewWindowConfiguration}
  