1064 - You have an error in your SQL syntax

-- HikaShop version -- : 2.6.1
-- Joomla version -- : 3.4.8
-- PHP version -- : 5.6
-- Error-message(debug-mod must be tuned on) -- : 1064 - You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '' at line 1 SQL=SELECT a.value FROM porv5_fieldsattach_values as a INNER JOIN porv5_fieldsattach as b ON b.id = a.fieldsid WHERE a.fieldsid IN (5) AND (b.language="de-DE" OR b.language="*" ) AND a.articleid=

Dear team, we are currently in the process of updating an installation of the customer on a test server. We first updated Joomla from 2.5.28 to 3.4.8, then all extensions. But visiting the hikashop does not work anymore and shows the above mentioned error. Any idea / help?

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sorry about that, i should have payd more attention what the sql statement says...
thanks!