If a user creates an auction that accepts bids AND a buy it now purchase and the auction receives a buy it now, everything works great. But if the auction receives bids first and then someone buys it now, there is an error thrown.
We need someone more familiar with XF development than we are to go in and fix this one bug.
Please contact Jim@kitchenknifefora.com with your details, portfolio, and rates. Or you can respond to me here and I can put you in touch.
If you have any questions, please don't hesitate to ask.