WEIRD LEAGUE CRASH HELP PLS

So i just started a rank game and everything was fine, but then suddenly my league crashes and this thing called "Bugsplat" not really sure what it is called comes up on my screen telling me to report the bug. I just closed the window and tried to reconnect to the game, but then it said that i had no internet connection which is weird since my internet was running perfectly. It has happened to me a couple of times before and i do not know why but its very irritating when i have to afk in a rank game because of that bug. I hope there is some way that you can help me :D - Markus.