Index: uc_mailchimp.module
===================================================================
--- uc_mailchimp.module	(revision 4680)
+++ uc_mailchimp.module	(working copy)
@@ -247,7 +247,7 @@
  * @param $params
  * The MailChimp API paramaters for the method being called
  */
-function _uc_mailchimp_call_api($method,$params=NULL) {
+function _uc_mailchimp_call_api($method,$params=array()) {
     if(module_exists('emf_mailchimp')){
         module_load_include('inc', 'emf_mailchimp','emf_mailchimp.api');
         $result = _emf_mailchimp_api_call($method, $params);