When saving a product that is already existing in the description the product is giving a weird error on the database:

SQLSTATE[23000]: Integrity constraint violation: 1452 Cannot add or 

update a child row: a foreign key constraint fails (`magento`.`catalog_product_entity`, CONSTRAINT 


(`attribute_set_id`) REFERENCES `eav_attribute_set` 

(`attribute_set_id`) ON DELET), query was: UPDATE 

`catalog_product_entity` SET `attribute_set_id` = ?, `type_id` = ?, 

`sku` = ?, `has_options` = ?, `required_options` = ?, `created_at` = 

'2017-11-01 20:36:00', `updated_at` = '2017-11-03 16:48:30' WHERE 


What is going wrong and where can I resolve this? It is not happening for all products but just for certain products in the collection.


I also had the same error, in my case this error occur when I was trying to assign attribute set to a product which is not exist. So please check if Attribute set exist or not which you are trying to assign to your product.

Or check your max_input_vars value and update it to 3000 or 5000, if it is less.

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