i have problem with Import/Export TOOL on Opencart 2.0.2.
I exported original products, add 1-2 testing products and reimport. No products will add, but if im make new product so i see below error and new product is rename to testing products from import....
Im not understand this

PLEASE COULD SOMEBODY HELP ME?
THANK YOU!
ERROR MSG:
Warning: mysqli::query() [mysqli.query]: (21000/1242): Subquery returns more than 1 row in /home/progamershop.cz/progamershop.cz/system/library/db/mysqli.php on line 19Notice: Error: Subquery returns more than 1 row
Error No: 1242
SELECT DISTINCT *, (SELECT keyword FROM oc_url_alias WHERE query = 'product_id=50') AS keyword FROM oc_product p LEFT JOIN oc_product_description pd ON (p.product_id = pd.product_id) WHERE p.product_id = '50' AND pd.language_id = '2' in /home/progamershop.cz/progamershop.cz/system/library/db/mysqli.php on line 41Notice: Trying to get property of non-object in /home/progamershop.cz/progamershop.cz/admin/model/catalog/product.php on line 345