Bug - couldt use keyboard to cast anything

hi,

after entering a game of LOL today (nomal game ARAM) i couldt use my keyboard to play the game.

-chat worked -it was not possible to cast summuner spells or championskills with the keyboard (i played Victor) -after leaving the game and reconnecting the problem didnt go away (i didnt close the client only the game) -after rebooting the PC everything worked again

According to google the same issue was reported in old (already closed) threads.