Thank you for being able to show the repeatable scenario
Here, two things clash: You can't do a combat, because the staff does no damage without the spell. But Goblin is repeatably queue-able, so it tries to queue it, then can't, then tries again. That's my bad, I will try to fix it as soon as possible.
If you lost your save because of this, I can enable a cheat combination if you want. Would allow you to catch back up if you want to continue playing.