Login problem

Hello guys.Could you help me with a problem of mine ? So an hour ago I played LoL normally then I stopped playing for half an hour and after that when I tried to start the game there was a problem.Okay the problem was that there were opening 2 tabs.The first one is a league of legends'tab saying 'recconect' and the second tab was a league of legends client which was completely black.After 10/15 seconds it showed a notificatin problem which said that I had a network problem but I am sure that my internet connection is fine because I can open browsers and talk with friends via discord without problems...So that's the problem and I would be very thankful If someone could help me with finding a solution to this problem.