Article sold for zero dollars? What happened?

[geniuswaitress]

Just received an email notice that an old article sold for 0.00. It also shows as zero on my dashboard. It has an actual usage price of actual dollars. Please tell me this is a glitch?

[Constant]

One of the customers who previously purchased a license to this article added it to an order again. Since she already owns a license, she wasn't charged. It is a glitch in that she shouldn't have been able to add it to the order today. We'll get that fixed asap.

[geniuswaitress]

Ah, that makes sense. Thanks.