Hi! I found a little bug in the downloadable script with a shop demo. When you click on the buy button without having previously selected any item, all the money disappears. I have solved it by adding "&& totalCost>0" to line 55 of the ShopBuy.cs. I don't know if it will be the best way, but at least it works.
I leave here a link with the video of the process
All the best
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Thanks for the report, I'll look to correct this in the official package.