"Finish" in Cart raises error

-- HikaShop version -- : 2.6.6
-- Joomla version -- : 3.4.4
-- PHP version -- : 5.6.13
-- Browser(s) name and version -- : N/A
-- Error-message(debug-mod must be tuned on) -- : 1054 Unknown column 'Array' in 'where clause' SQL=SELECT * FROM ps_hikashop_product WHERE product_id = Array LIMIT 1

Cannot get to paypal from cart, pressing the Finish button in the cart raises the error.

Hello,
It's actually working fine on my end, can you download the last Hikashop version on our website, install it and test it again ?
Thanks.