Trying to get property of non-object in mailchimp_lists_cron()

Notice: Trying to get property of non-object in mailchimp_lists_cron() (line 118 of /var/www-sites/drupal/dstore/sites/mp3sa.co.za/modules/mailchimp/modules/mailchimp_lists/mailchimp_lists.module).

followed by

Warning: array_flip(): Can only flip STRING and INTEGER values! in EntityAPIController->load() (line 175 of /var/www-sites/drupal/dstore/sites/mp3sa.co.za/modules/entity/includes/entity.controller.inc).