Hi,
Thanks for the report.
Please edit the file "plugins/hikamarket/duplicateproduct/duplicateproduct.php" and replace
$query = 'SELECT pc.product_id FROM ' . hikamarket::table('shop.product_category') . ' AS pc '.
' INNER JOIN ' . hikamarket::table('shop.product') . ' AS p ON pc.product_id = p.product_id '.
' WHERE p.product_vendor_id = 0 AND pc.category_id IN '. implode(',', $categories_id).')';
By
$query = 'SELECT pc.product_id FROM ' . hikamarket::table('shop.product_category') . ' AS pc '.
' INNER JOIN ' . hikamarket::table('shop.product') . ' AS p ON pc.product_id = p.product_id '.
' WHERE p.product_vendor_id = 0 AND pc.category_id IN ('. implode(',', $categories_id).')';
It will fix the SQL issue.
We will integrate this patch in the next release.
Regards,