It's because `asset` and `object` columns didn't modify to support NULL for whatever reason. The code is there and has been tested, but something with your database is preventing it. It's just not possible for me to cover every scenario.
At any rate please try installing latest CB Activity build release as I've removed the unique index so it should be fine now. Next major release of CB Activity will be migrating those away into their own database tables (looks like it'll be around 7 tables to cover all hidden cases).
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Thank you,
I have been able to update without any errors on 2 different sites. The new update successfully updated the table to use NULL as default value.
Thank you,
Tomás