При установке модуля есть ошибка с существующими товарами. Как быть?

[petiforovdima7]

SyntaxError: JSON.parse: unexpected character at line 1 column 1 of the JSON data
OK
Notice: Undefined index: unit_id in /var/www/cha02dfea7/www/miydim.sumy.ua/system/storage/modification/catalog/controller/checkout/cart.php on line 344

Fatal error: Uncaught exception 'Exception' with message 'Error: 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<br />Error No: 1064<br />INSERT oc_cart SET api_id = '0', customer_id = '1', session_id = '868cad548f564ba0e192d267b3', product_id = '1', recurring_id = '0', option = '[]', quantity = '1', date_added = NOW(), unit_id = ' in /var/www/cha02dfea7/www/miydim.sumy.ua/system/library/db/mysqli.php:40
Stack trace:
#0 /var/www/cha02dfea7/www/miydim.sumy.ua/system/library/db.php(16): DB\MySQLi->query('INSERT oc_cart ...', Array)
#1 /var/www/cha02dfea7/www/miydim.sumy.ua/system/storage/modification/system/library/cart/cart.php(277): DB->query('INSERT oc_cart ...')
#2 /var/www/cha02dfea7/www/miydim.sumy.ua/system/storage/modification/catalog/controller/checkout/cart.php(344): Cart\Cart->add('1', 1, Array, 0, NULL)
#3 [internal function]: ControllerCheckoutCart->add()
#4 /var/www/cha02dfea7/www/miydim.sumy.ua/system/storage/ in /var/www/cha02dfea7/www/miydim.sumy.ua/system/library/db/mysqli.php on line 40