As you can see. I was playing Warrior and after it decided to try to use 'Rampage' it threw an Exception error and halted the bot. I think this happens when it tries to look for a damaged minion to apply the buff to and it can't seem to do it.
Bot for me is halted whenever it's considering a card that requires the coin, it'll throw an exception during the priority calculation. Manually dropping the coin and restarting the bot fixes it.
