[crash] Problem connecting to game involving Leaver Buster and Zac Chroma pack

I have been playing some games with prolonged queue (20 minutes) now, because of a previous bugsplat. Everything went well. Untill I tried to play my first game without queue. Not sure if it has anything to do with it, but I chose one of Zac's Chroma skins.
The champions were all chosen, but when the loading screen should have started, I get a bugsplat. I tried login in again but always the same bugsplat emerged, leaving me unable to join the game. Resulting with another Leaver Buster. The funny thing is that my previous Leaver Buster was caused by the exact same problem. A bugsplat popped up, leaving me unable to join the game because I picked the Zac Chroma pack.
Now I'm trying to play any other champs in custom game, to see if other champs have the same problem. But I can't even test other champs, because they get the same bugsplat. (not sure wether this is caused by Leaver Buster disabling custom games or not.. )

Can someone help me? I don't like getting another 5 times 20 minute queues (after my Leaver Buster is finished) {{summoner:2}}