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After Data Migration error "unserialize value" on add or edit product

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After Data Migration error "unserialize value" on add or edit product

Hello,

migrated magento site from 1.7.0.2 to 2.2 clean install. Migration completed without issues.

However if I attempt to edit a product or add a new product magento displays an error:

 

Unable to unserialize value.

Customers, categories and custom attributes all migrated without issue.

I've already tried to re-indexing the database with the command "bin/magento indexer:reindex" and clear,flush the cache.

Does anyone know what i'm doing wrong here?

Thanks