[CLIENT] Friends list is empty

My friends list is suddenly empty. Earlier today when I logged in everything was fine, but later I logged in again and suddenly all my friends were gone. I tried restarting the client multiple times, restarting my computer, logging in on another computer and even repatching the client but it still shows that my friends list is empty. League of Lgeneds app shows the same. My friend's client, whose friends list is fine, showed that I wasn't their friend either, then sent me a friend request and I was able to accept it although we should already be friends. I'm also unable to send gifts.