// Where it's invoked...

<ParentPageComp>
  <Dialog open>
    <MyConnectedComponent />
  </Dialog>
</ParentPageComp>

// What is being attempted to render...

class MyConnectedComponent extends React.Component {
  render() {
    return <div>Yeppers</div>;
  }
 }

export default connect(state => ({ blah: state.blah }))(MyConnectedComponent);