Can't buy skill bauble at Swap N Shop

Trying to buy skill bauble, have 5241 silver, buying 3k bauble. it updates the correct remaining balance in the shop window but when i try to confirm it I get an error message that it's "too expensive." bought a 150s experience bauble, worked fine, then tried again with same error. Relogged, still same thing.

This is a bug that can happen if you don't have enough gold coins to purchase the item, even though it doesn't cost any gold coins.

For now you can work around this by ensuring you have enough gold coins on the character interacting with the silver shop.