TypeError: Cannot read properties of null (reading 'user') in a React project

Question

I'm getting this error when starting up the server for my admin panel. Here's the file that originates the error:

import axios from 'axios';

const BASE_URL = 'http://localhost:5000/api/';
const TOKEN = JSON.parse(JSON.parse(localStorage.getItem('persist:root')).user)
  .currentUser.accessToken;

export const publicRequest = axios.create({
  baseURL: BASE_URL,
});

export const userRequest = axios.create({
  baseURL: BASE_URL,
  headers: { token: `Bearer ${TOKEN}` },
});

I'm using pretty much the same code in the client and server side of the app and they work just fine. Any ideas what I should check?