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Cannot read property 'id' of null From Realm database

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I'm getting an error when I want to export a default realm configuration useRealm so that I will be able to use it other files

import Realm from "realm";import { getRealmApp } from "../functions/realmConfig";import { ItemSchema } from "./itemSchema";export const app = getRealmApp();export const useRealmApp = getRealmApp();export const user = useRealmApp.currentUser;export const partitionValue = useRealmApp.currentUser.id;export const config = {  schema: [ItemSchema], //other schema will be added in the future  sync: {    user: user,    partitionValue: partitionValue, //app.currentUser.id,  },};export const useRealm = new Realm(config);

expected results is, if the user is not logged in it should show a login screen. But it throws this error and doesn't give me a chance to log in:

index.ts?77fd:9 Uncaught TypeError: Cannot read property 'id' of null    at eval (index.ts?77fd:9)    at Object../src/realm/index.ts (renderer.js:5394)    at __webpack_require__ (renderer.js:791)    at fn (renderer.js:102)    at eval (testIndex.tsx?956d:10)    at Object../testIndex.tsx (renderer.js:5438)    at __webpack_require__ (renderer.js:791)    at fn (renderer.js:102)    at eval (App.tsx?d35d:4)

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