Item has already been added. Key in dictionary: 'period' Key being added: 'period'

Has anyone seen this error when trying to edit an APM Template?

What did you do to fix the problem?

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Please have a look to 'ResourceProperties' table in your Orion database. There should not be any records with ResourceID = 0.

If there are any rows with ResourceID = 0, then you will need to delete them.

Please make sure you have database backup available just to be safe.

Two rows with ID=0, deleted rows and things are looking better

Thanks for your help