vendor/magento/framework/Data/Collection.php

[savandholu]

vendor/magento/framework/Data/Collection.php

line : 406

 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 {
            $this->_addItem($item);
        }
        return $this;
    }

become => below, wait for M2 fix
public function addItem(\Magento\Framework\DataObject $item)
{
$itemId = $this->_getItemId($item);

    if ($itemId !== null) {
        if (isset($this->_items[$itemId])) {
        return $this;
        }
        $this->_items[$itemId] = $item;
    } else {
        $this->_addItem($item);
    }
    return $this;
}

Originally posted by @smagic39 in #6126 (comment)

Changes file code but it's not working

[m2-assistant]

Hi @savan13. Thank you for your report.
To help us process this issue please make sure that you provided the following information:

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@magento give me 2.4-develop instance - upcoming 2.4.x release

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[m2-assistant]

Hi @engcom-Delta. Thank you for working on this issue.
In order to make sure that issue has enough information and ready for development, please read and check the following instruction: 👇

• 1. Verify that issue has all the required information. (Preconditions, Steps to reproduce, Expected result, Actual result).

  Details

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• 3. Add Component: XXXXX label(s) to the ticket, indicating the components it may be related to.

• 4. Verify that the issue is reproducible on 2.4-develop branch

  Details

  - Add the comment @magento give me 2.4-develop instance to deploy test instance on Magento infrastructure.
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[engcom-Delta]

Hi @savan13,

Kindly provide the issue description, steps to reproduce, Actual results and expected results. so that we will try to reproduce the issue.

Thanks

[engcom-Delta]

There has no update from the reporter and it is ~ 14 days. Hence closing the issue.
Kindly raise new ticket if required or re-open the existing issue.

Thanks