Magento 2 unknown error on exception.log

Question

Keep getting below error every 5 minutes in exception log:

[2018-06-20 04:35:05] main.CRITICAL: Item (Magento\Catalog\Model\Product\Interceptor) with the same ID "704" already exists. {"exception":"[object] (Exception(code: 0): Item (Magento\Catalog\Model\Product\Interceptor) with the same ID \"704\" already exists. at /vendor/magento/framework/Data/Collection.php:404)"} []

Answer 1

To quickly fix it you can delete all rows that have duplicated products IDs in cataloginventory_stock_item table.

Answer 2

solved, by finding the Product and then re-save it again then re index.