Uncaught runtime errors if i cancel the minting transaction.

[mandududdudu]

Hi, I deploy the code to my local environment.
When I click "buy", it will show up the metamask pop up which is what I expected.
But when I click reject / "X" on the top right corner to rescind the transaction, it will pop up an error.

I know that I can click "X" on the top right corner of the pop-up window to make the error disappear.
But I think this is not proper to deal with the error.

Can anyone help?
I appreciate it. Thank you very much.