While listing product to the marketplace in SelluSeller, it may happen that you would observe the error "undefined method 'collect' for nil:NilClass"
This is the internal system error received while uploading products or when option values are missing.
Action required from your end
1. Check if all the option types for product variations are added and once again 'Update' the product.
2. Even after performing above step if error does not get resolved, please report the error to Anchanto support team.
We hope the details above were helpful for you. In case you have any further feedback please feel free to share with us and will be happy to take it up.