When bench is full, you are able to buy more units than you have gold

In my latest game I had my bench full, with a two-star on the board, one two-star and one one-star on the bench. At this point I only had 2 or 3 gold and in the shop there appeared 2 .

In this case, the game lets you buy both of them by clicking one of them. It's only logical because when you have a full bench and you need one champion to upgrade him, the game lets you and in the case of two missing, you cannot buy both but you would have enough space on the bench if you bought both of them, so the game lets you.

The problem is that in this case the gold doesn't matter, thus I spent 4 gold out of my 2 or 3 gold so my gold value was at the unsigned int max's value minus 1, 4294967294. At the beginning of the next round, after winning 5 gold, I had 4 gold left, so no problem were there.

I think I was not able to buy anything with that amount of money, it was still considered less than 1.

I have photo as proof if needed. Taken with my phone at an angle to dismiss accusations of photoshop.