Game Crashes on Out-of-Bounds Tile Selection Confirmation

Thanks for taking the time to note that. I've not entirely settled on how I will be arranging actions in their final form, and I still consider them early prototype. I definitely need to add at least one more validation step (maybe more), and plan to, before I call the project done. There are a lot of rules to consider so I am still feeling out the where and when etc. I may add a few more actions (like spells) before I settle on something. Feel free to call out any and every bug you see though because it is helpful to keep track of them.