Webform Analysis - Error PDOException: SQLSTATE[42000]

I am using several webforms on my site and they seem to work flawlessly until I click the Results tab - Analysis link on all of my webforms. They each throw the following error:

PDOException: SQLSTATE[42000]: Syntax error or access violation: 1064 You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ')) GROUP BY data' at line 1: SELECT wsd.data AS data, COUNT(data) AS datacount FROM {webform_submitted_data} wsd WHERE (nid = :db_condition_placeholder_0) AND (cid = :db_condition_placeholder_1) AND (data <> :db_condition_placeholder_2) AND (data IN ()) GROUP BY data; Array ( [:db_condition_placeholder_0] => 18 [:db_condition_placeholder_1] => 13 [:db_condition_placeholder_2] => ) in _webform_analysis_select() (line 641 of /home/barton/www/las/drupal/sites/all/modules/webform/components/select.inc).