I have this error,

1 exception(s):
Exception #0 (Exception): Item (Magento\Eav\Model\Entity\Attribute) with the same ID "87" already exists.

it seems to me that there must be a duplicate row ?

But what Table as I cant find one.


  • Please have a look on eav_attribute table – aman Jan 16 '19 at 3:08
  • You need to go to database with table name, eav_attribute Now check field within this table and if duplicates row are exist one field need to delete. – Rahul Singh Jan 16 '19 at 6:59
  • I can see lots of rows with duplicate attribute codes but the duplicates have a unique entity id - so they dont look like duplicates to me ? – garyconstable Jan 16 '19 at 8:32

Some migration or system that populates the database which caused the duplication of IDs. Magento core predicts a data created by its self, so this kind of error could be solved without stopping the system but it was not implemented yet (e.g. Github issue in the reference session).


  • Recreate the attribute or remove the attribute
  • Change the attribute ID through the database
  • Create a core patch to skip attribute with error to not show or show it unfilled in the product page to edit as below (creating a module):
// file: vendor/magento/framework/Data/Collection.php

    public function addItem(\Magento\Framework\DataObject $item)
        $itemId = $this->_getItemId($item);

        if ($itemId !== null) {
//            if (isset($this->_items[$itemId])) {
//                throw new \Exception(
//                    'Item (' . get_class($item) . ') with the same ID "' . $item->getId() . '" already exists.'
//                );
//            }
            $this->_items[$itemId] = $item;
        } else {
        return $this;
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