Fatal Error when save configurable product in Magento 2.2.5

[vpatidar009]

Preconditions

PHP 7.1
MYSQL 5.6
Magento 2.2.5

Steps to reproduce

1. Add new configurable product with name and sku of 63 characters length For Example: "Amzer 203877 Kristal FULL HD Tempered Glass for OnePlus 6 Clear". Screenshot: https://drive.google.com/file/d/1YQGb1h2J3oAfy6ihkCeZ7-Elbk6EYMaP/view?usp=drivesdk
2. Create configuration of the product. Screenshot: https://drive.google.com/file/d/1EPspkolJGVhmSavKphDlIjOLT3k-QijU/view?usp=drivesdk
3. Now, When you try to save it's configuration, It shows client side validation error for child products SKUs. Decrease length of child product's SKUs and then save the product. It generates a error report as attached. Screenshot: https://drive.google.com/file/d/1VTuD3gE2NVa3H1ndfi8xus7fGx2xUpDJ/view?usp=drivesdk

Expected result

1. Save products without any error with SKU length less then or equal to 64

Actual result

1.Getting major error when save such product. even after decrease lenght of SKU to valid client side validation.

report.zip

[magento-engcom-team]

Hi @vpatidar009. Thank you for your report.
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@vpatidar009 do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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Hi @vpatidar009 I'm not able to reproduce following steps you described, I'm not have an error report generated.

[vpatidar009]

Hi @engcom-backlog-nazar ,
It is not possible as I have tested 2-3 instances of magento 2.2.5 version and all versions are vanilla magento.

I am pretty sure about the error and I can reproduce the issue at your environment if you can give me access of the environment.

[vpatidar009]

@engcom-backlog-nazar https://github.com/magento/magento2/files/2386900/report.zip

I have also added screenshots URL in my initial message. Hope those screenshots will help you.