A client error that prevents me from joining a game

This has only happened once before. But I was invited to play a game, so I joined lobby and then we started the queue. I got the "A game has been found" button I hit yes.

But basically I went straight back to the pre-queue lobby. Looked at my friends list and everyone else was in champ select. Luckily it wasn't an ARAM and the game dodged out. Last time it was an aram and I couldn't join the game no matter what, I could ONLY spectate.