Upgrade to 6.x-2.x-dev caused Mailchimp module to break

Mailchimp module was all working perfectly until I upgraded.

I now get following at http://www.ashford-hockey.co.uk/drupal/?q=admin/settings/mailchimp

* warning: Invalid argument supplied for foreach() in /home/ashfordh/public_html/drupal/modules/mailchimp/mailchimp.module on line 666.
* warning: Invalid argument supplied for foreach() in /home/ashfordh/public_html/drupal/modules/mailchimp/mailchimp.module on line 666.
* warning: Invalid argument supplied for foreach() in /home/ashfordh/public_html/drupal/modules/mailchimp/mailchimp.module on line 666.

I have three list at my Mailchimp account.

Code is:

664 if (function_exists('token_get_list')) {
665 $tokens = token_get_list(array('user', 'order'));
666 foreach ($tokens['user'] as $token => $name) {
667 $out['token_'. $token] = t('Token: !field', array('!field' => $name));
668 }
669 }

Any help much appreciated.

Thanks

Roger