reactotron: null is not an object (evaluating 'reduxStore.getState')

I met this error. When I refresh several times, sometimes it runs.

This is my files

// reactoron-config.js
import Reactotron, { trackGlobalErrors } from 'reactotron-react-native';
import apisaucePlugin from 'reactotron-apisauce';  // <--- import
import { reactotronRedux } from 'reactotron-redux';
import sagaPlugin from 'reactotron-redux-saga';

console.tron = Reactotron;

Reactotron
  .configure() // we can use plugins here -- more on this later
  .use(trackGlobalErrors()) // <--- here we go!
  .use(apisaucePlugin())
  .use(reactotronRedux())
  .use(sagaPlugin())
  .connect(); // let's connect!

export default Reactotron;

// configureStore.js
import { applyMiddleware, compose } from 'redux';
import createSagaMiddleware from 'redux-saga';
import thunk from 'redux-thunk';

import Reactotron from '../../env/reactotron-config';

import reducers from '../ducks';
import rootSaga from '../saga';

import googleAnalytics from './middleware/googleAnalytics';

const isDebuggingInChrome = __DEV__ && !!window.navigator.userAgent;
const sagaMonitor = Reactotron.createSagaMonitor();

function configureStore(onComplete) {
  const sagaMiddleware = createSagaMiddleware({ sagaMonitor });

  const store = Reactotron.createStore(reducers, {}, compose(
    applyMiddleware(sagaMiddleware, thunk, googleAnalytics),
  ));
  sagaMiddleware.run(rootSaga);

  if (isDebuggingInChrome) {
    window.store = store;
  }
  setTimeout(() => {
    onComplete(store.getState());
  });

  return store;
}

// Setup.js
class Setup extends Component {
  constructor() {
    super();
    GoogleAnalytics.setTrackerId('UA-86299762-1');
    this.state = {
      isLoading: true,
      store: configureStore((state) => {
        this.setState({ isLoading: false });
        if (state.user.nickname) {
          const { nickname, school } = state.user;
          GoogleAnalytics.setUser(nickname);
          setCrashlytics(nickname, school);
        }
      }),
    };
    // console.disableYellowBox = true;
  }

  render() {
    if (this.state.isLoading) {
      return <LoadingScreen />;
    }
    return (
      <Provider store={this.state.store}>
        <App />
      </Provider>
    );
  }
}

RN version: 0.38 reactotron-react-native: 1.6.0 reactotron-redux: 1.6.1