V16 purchase order can't have decimal value

Hi I first tested v16.3

as the pic below, when purchase order had decimal amount,submit got error:

Response Data

{
	"exception": "TypeError: can only concatenate str (not \"NoneType\") to str",
	"exc_type": "TypeError",
	"_exc_source": "erpnext (app)"
}

When I modify the product price to be an integer value(eg. xyz.00), submit with no error

Then I set up ERPNext v15.95.2 in docker, this is all ok