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

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