Bug: Invites being out of sync prevents tracking of an unrelated join

When a user joins a server where invites are out of sync between the service and local database, it is possible that this will result in an exception that halts correlation. This is true even if the code that the user joined on isn't the code that is out of sync.

We need to add error handling such that these specific sync issues are logged, and passed over, allowing correlation to continue.