Every second time i login into my account i have 0 friends

So i login one day and i saw i have 0 friends online, but when i turn on to see my offline friends i saw that i don't have friends at all, but i had at least 50 friends on my list. So now i have to add people everytime i login into your client so is there a problem fixer or i have to do this evertime i wanna play with my friends? Thank you

Summoner name: sprinkless