Bughunt: Seller can bid his/hers own product

Summary

Seller can place a bid to his/hers own product.

Steps to Reproduce

1. Add item to be auctioned
2. Go to the item you just added
3. Place a bid on that item

Expected Outcome

You should't be able to bid on items.

Actual Outcome

You can bid your own items

Possible fixes

Maybe disable or remove the bidding button if you are the owner of that product