error 1267 UTF8 on orders

-- HikaShop version -- : 2.6.1
-- Joomla version -- : 3.5
-- PHP version -- : 5
-- Error-message(debug-mod must be tuned on) -- : 1267 Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation 'ifnull' SQL=SELECT a.*,b.*,c.*,IFNULL(c.name,CONCAT_WS(' ',d.address_firstname,d.address_middle_name,d.address_lastname)) AS hikashop_name FROM #__hikashop_order AS b LEFT JOIN #__hikashop_address AS d ON b.order_billing_address_id=d.address_id LEFT JOIN #__hikashop_user AS a ON b.order_user_id=a.user_id LEFT JOIN #__users AS c ON a.user_cms_id=c.id WHERE (b.order_type='sale') ORDER BY b.order_id desc LIMIT 0, 20

Hi,
in the process of finishing up a site and when I get the orders, I get an error message 1267
1267 Illegal mix of collations (utf8_unicode_ci,IMPLICIT) and (utf8_general_ci,IMPLICIT) for operation 'ifnull' SQL=SELECT a.*,b.*,c.*,IFNULL(c.name,CONCAT_WS(' ',d.address_firstname,d.address_middle_name,d.address_lastname)) AS hikashop_name FROM #__hikashop_order AS b LEFT JOIN #__hikashop_address AS d ON b.order_billing_address_id=d.address_id LEFT JOIN #__hikashop_user AS a ON b.order_user_id=a.user_id LEFT JOIN #__users AS c ON a.user_cms_id=c.id WHERE (b.order_type='sale') ORDER BY b.order_id desc LIMIT 0, 20 .
I double checked and the whole databeas is set up as a utf-8 unicode which, I thought, was a prerequisite. Can someopne tell me if the error comes from the utf8 encoding or elsewhere and what should I do to get back to my orders listing.
Thanks

Hi Nicolas,
thanks, that solved the issue. However, It made a whole position (left) disappear on the public site...
Any insight?

No, me neither... (I did not see any link between the 2 of them) but since the error showed up right after the update, I thought there might be something.
Well, I looked into my template folders and there was indeed a missing closing statement for a div.
Thanks.