Good morning, I have one problem 

The first problem is that after entering the category on the website, an error is displayed:
 /pl/index.php?page=search&sCategory=2.

- has provided too many redirects. ERR_TOO_MANY_REDIRECTS

This is a problem only in categories, other tabs, e.g. favorites, messages work properly.

You cannot use language code in url when friendly urls are not enabled

You cannot use language code in url when friendly urls are not enabled

Thank you for your answer, both of these options are disabled and the problem still exists. Unable to enter the category.

Another reason why this use to happen is wrong rel path in config file