Updating Civicrm Activities with Drupal Webforms
Looks like this is an error that appeared with the Webform_Civicrm Module once updated Civicrm 4.6.18.
The reason I wasn't able to reproduce this error on my second site is because I didn't have the data needed to produce the error. 
Issue was opened here: https://www.drupal.org/node/2759099