Hi,
We are not able to access to your website ; it looks like the entire country (FR) has been blacklisted...
Otherwise, regarding the code, I think that the product is assigned with a vendor which does not exist anymore.
So the loading of the vendor data is returning an empty data and it generates that warning (which is just a warning, not a blocking error).
First, you should take a look at the product configuration in order to check that the data is correct.
Regards,
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.