Hello Carlo, 

The KeyError: None error in your Odoo logs typically indicates that a cron job (automated background task) has an undefined or incorrect interval type. This can happen if the interval_type field in the ir.cron table is missing, set to None, or incorrectly configured after a database restore.

Here’s how you can debug and fix this issue:

1. Check the ir.cron Table for Missing or Invalid Values

1. Access the Database:
   • Use a PostgreSQL client (e.g., psql on the command line) to connect to your database.
2. Run a Query to Check interval_type:
   • Run this SQL query to identify any cron jobs with an invalid interval_type:
     SELECT id, name, interval_type, interval_number FROM ir_cron WHERE interval_type IS NULL OR interval_type NOT IN ('minutes', 'hours', 'days', 'weeks', 'months');
          This will show any records where interval_type is missing or invalid.
3. Update the Missing Values:
   • If any rows have interval_type set to NULL or contain invalid values, update them with a valid interval_type value (such as 'days' or 'hours').
          Example SQL to update the value:
          UPDATE ir_cron SET interval_type = 'days' WHERE id = <id_of_the_cron_job>; 
          Replace <id_of_the_cron_job> with the actual ID of the cron job.

2. Restart the Odoo Service: After making changes to the database, restart the Odoo service to apply the fixes.
sudo service odoo restart

3. Debugging and Monitoring

1. Check the Logs: After restarting, monitor the logs to ensure the error no longer appears.
2. Verify Cron Jobs: Go to Settings > Technical > Automation > Scheduled Actions in Odoo, check that all cron jobs are enabled, and ensure they have valid interval types.

Let me this helps :)