http://stackoverflow.com/questions/42941944/setstate-cannot-update-during-an-existing-state-transition-with-redux-conn?noredirect=1#comment73026474_42941944

index_reducer.js

import { combineReducers } from 'redux';
import level1 from './level1';

export default combineReducers({
  data: level1,
});

initial_state.js

export default {
  someId: {
    id: '123',
  },
  data: {
      level1: {
      someMap: [
        { id: '123' },
        { id: '456' },
      ]
    },
  }
}

level1_reducer.js

import C from '../constants';
import initialState from '../initial_state';
import { fromJS } from 'immutable';

export default (state = fromJS(initialState.data), action) => {
  switch (action.type) {
    default: {
      return state;
    }
  }
};

Simple.js

import React from 'react';
import { connect } from 'react-redux';
import { fromJS } from 'immutable';

const props = { someId: '123' };
const Simple = (props) => (
  <div>testing</div>
);

export default connect(
  (state, ownProps = props) => {
    const someId = ownProps.someId;
    const someMap = state.data
      .getIn(['level1', 'someMap'])
      .filter(some => {
        console.log(some)
        return some.get('id') === someId
      });

    return ({
      someMap,
    });
  },

)(Simple);