What is the cause of the application error on ios browsers?

Question

React

In order not to really bring tons of code, we abstract from it and take a purely theory.

There is an application on react, at some point it happens

// ... тут запрос с сервера на получение данных, который выполняется синхронно, через промисы
// переменная result - это ответ от сервера
const result  = 'string'

localStorage.setItem('result', result);
document.location.pathname = /

The page is reloaded and in the App.js component, a request is made to the server, which uses the header written based on the result.

So on mobile devices (iPhones) in all browsers after these steps a white screen appears. With what it can be connected?

There is an assumption that there is a jamb in the local storage, which causes an error in production. After all, a white screen is a characteristic feature for a Reakt build in case of an error.

Any thoughts on what is causing this?