thenbrent/woocommerce-mailchimp — pull request #1 by mirkolofio (2013-11-19 07:27:11+00:00)
Title: Update class-ss-wc-integration-mailchimp.php

It'll solve this issue: "Warning: array_merge(): Argument #2 is not an array in /[..]/woocommerce-mailchimp/classes/class-ss-wc-integration-mailchimp.php on line 141"