The error and the solution of the problem have been obtained as a result of migration from Magento 1 (1.9. *) To Magento 2 (2.3.5-p1), but also can be after updating Magento, for example from version 2.2.7 to version 2.3.2.

Main causes:

– Migration from M1 to M2
– Update M2

https://soft-loft.com/magento-migration-issue-cant-edit-a-product-in-admin-panel-illegal-offset-type-in-isset-or-empty/

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