We have a multivendor eshop.
The problem appears when a customer tries to add to cart a product with variants.
It seems that the variant product loses the vendor so the customer can't proceed to checkout.
Please check it and tell me if this is a bug or it has to do with our hikamarket settings.
Thank you.
Jerome - Obsidev.com
HikaMarket & HikaSerial developer / HikaShop core dev team.
Also helping the HikaShop support team when having some time or couldn't sleep.
By the way, do not send me private message, use the "contact us" form instead.