SQL Error when showing catgegorie list

-- url of the page with the problem -- : www.safesuntan.nl
-- HikaShop version -- : 2.3.1
-- Joomla version -- : 3.3.0x
-- PHP version -- : 5.4.26
-- Browser(s) name and version -- : Firefox
-- Error-message(debug-mod must be tuned on) -- : 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=EXPLAIN SELECT cat.description FROM suntan_categories cat WHERE cat.id=

reinstalled second time and still the same error.
anything i can do?

Fixed!
I had the SEO Simple plugin installed.
That made the error, depublised and it works!

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