Consider the following scenario:
You use Replication in Microsoft SQL Server 2012 or SQL Server 2014.
You add a subscription in the Replication subscription, and then delete it.
In this scenario, you may receive the following error 515:
Cannot insert the value NULL into column 'article_id', table '<DistributionDatabaseName>.dbo.MSrepl_commands'; column does not allow nulls. INSERT fails.
The issue occurs because of a regression of SQL Server 2012. When you add a subscription, and then you delete it, Replication Metadata about the subscription is immediately deleted because there is a delay before the LogReader encounters the command to add the subscription.
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.