Duplicate Subscribers (WooCommerce & AWeber)

Hello Community,
One of my scenarios is generating an error, let me explain
On one side is WooCommerce, and the other side is AWeber
When a new order occurs, the customer’s name and email is added to an AWeber list
That part works fine
The problem is if another order occurs with the same customer, an error is generated stating the user already exists, and eventually the scenario is disabled
This shouldn’t happen because AWeber already handles duplicate subscribers
Does anyone know how I can configure the scenario to ignore (i.e. allow) duplicates?
Thank you