empty props Object.keys in React Redux rest-api - reactjs

Question

I'm trying to map / convert object from props in React. Data is coming from rest-api library and to component via mapStateToProps.
But when i try to use Object.keys its empty
console.log('storagesTree', this.props.storagesTree);
console.log('data', this.props.storagesTree.data);
let items = Object.keys(this.props.storagesTree.data);
console.log('length', items.length);
Below console report screen
UPDATE
this is my raw data from api:
{"#context":"\/admin\/api\/user_storages","#type":"UserStoragesList","user":"5eb2a2ae37f018528939f883","groups":{},"storages":{"first":{"create":true,"read":true,"update":true,"delete":true},"second":{"create":true,"read":true,"update":true,"delete":true}}}
file with fetching data from rest via redux-api library
import "isomorphic-fetch";
import reduxApi, {transformers} from "redux-api";
import adapterFetch from "redux-api/lib/adapters/fetch";
export default reduxApi({
storagesTree: {data: {}},
userInfo: {
url: `/admin/api/user_storages_test`,
postfetch: [
function({data, getState}) {
let {storagesTree} = getState();
for(const storage in data.storages) {
if(data.storages[storage].read === true) {
storagesTree.data[storage] = {};
}
}
}
]
}
}).use("rootUrl", "http://localhost:84").use("fetch", adapterFetch(fetch));
and my component, where i trying to use Object.keys
import React, { Component } from 'react'
import { render } from 'react-dom'
import {connect} from 'react-redux';
class StoragesTree extends Component {
render() {
console.log(JSON.stringify(this.props.storagesTree.data, null, 3))
console.log('storagesTree', this.props.storagesTree);
console.log('data', this.props.storagesTree.data);
var items = Object.keys(this.props.storagesTree.data);
console.log('lengths', items.length);
return (
<div>
<div>StoragesTree</div>
</div>
)
}
}
const mapStateToProps = state => {
const { userInfo, storagesTree } = state
return {
userInfo,
storagesTree,
}
}
export default connect(mapStateToProps)(StoragesTree)