Attribute "first" not found for Asset "bulkmail_user"

We are using this tip from the bulkmail manual:

[quote]Tip: If you are sending the email to both kind of users, you can use the following structure: Dear %recipient_asset_attribute_name% %recipient_asset_attribute_first_name%, If the user is a Bulkmail User, the first keyword replacement will show the name of the user and the second keyword replacement will show blank. If the user was a MySource Matrix user (for example a User), it will be the other way around.[/quote]

Works fine, but we have noticed the following MySource warnings in the error log when the job is completed: (/core/include/asset.inc:3063) - Attribute "first" not found for Asset "bulkmail_user" [SYS0094]



Is it safe to ignore this warning?

Thanks

Yes, you can ignore this error. It just means that some assets you sent to don't have a first name (i.e., bulkmail users).