joesheets on "[Plugin: WooCommerce Conversion Tracking] Compatibility with Woocommerce 2.6"

I just upgraded woocommerce to 2.6 and after the update I see the following error message at the top of the dashboard:

Waing: Declaration of WeDevs_WC_Tracking_Integration::validate_textarea_field($key) should be compatible with WC_Settings_API::validate_textarea_field($key, $value) in /home/clients/1d989383ee11099bb2d8468c003d5c0c/web/wp-content/plugins/woocommerce-conversion-tracking/includes/integration.php on line 302

I guess this is a compatibility issue?

https://wordpress.org/plugins/woocommerce-conversion-tracking/

Same thing is happening to me.

On the file below
/woocommerce-conversion-tracking/includes/integration.php: row: 83
I've changed the line from
function validate_textarea_field( $key)
to
function validate_textarea_field( $key, $value )

And the error is gone.

AI...I replaced that code, but the error is still there.
Any thoughts?