Exercises G22

Description
After clicking on the "Log in" button, the app consistently fails when attempting to log in.

Steps to Reproduce
1.Open the app on a smartphone.
2.Explore the application without logging in.
3.Attempt to write a comment on an article.
4.Click on the login button.
5.Provide valid credentials.
6.Chose "Log In" from the menu.

Expected Result
The app should log the user in once they provide correct login information and click the "Log in" button.
Actual Result
The software crashes when you click the "Log in" button. The identical crash error appears after restarting the app and trying to log in once again.