psycopg2.ProgrammingError: can't adapt type 'subscription.package'

[Rolando Pérez Rebollo]

CybroAddons/subscription_package/models/subscription_products.py

Line 41 in b2c207c

 'subscription_id': so_id.subscription_id}] 

This line is throwing psycopg2.ProgrammingError: can't adapt type 'subscription.package' when creating an invoice from a sale order related to any subscription. I got it right changing it by:
'subscription_id': so_id.subscription_id.id}]