ALPHA BUG: ARAM champ trade locked up and then error appeared

Was trying to trade with a teammate in ARAM on the alpha client and the (x) button was clickable but no action occurred. The teammate concluded the trade and then an error popped up saying that that action was impossible to complete. That message's [OK] button was also unresponsive so I didn't get to change my masteries, summoners, or runes because it blocked up the screens actionables.