After selecting store from upper left side, I'm not able to save product. I'm able to save product with all store view.

Gives this error when i try to save product with specific store view:

Fatal error: Uncaught TypeError: array_key_exists() expects parameter 2 to be array, null given in D:\xampp\htdocs\magento\vendor\magento\module-catalog\Model\Attribute\Source\AbstractLayoutUpdate.php:44 Stack trace: #0 D:\xampp\htdocs\magento\vendor\magento\module-catalog\Model\Attribute\Source\AbstractLayoutUpdate.php(44): array_key_exists(false, NULL)

I found that there is some issue with this "custom_layout_update_file" attribute.

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