Node preview causes "Call to undefined function webform_load() in webform.module"

I am currently testing the latest 6.x-3.x-dev (2010-Jan-24) version. When I am creating a new webform node and click the [ Preview ] button, I get a WSOD caused by the following error:

PHP Fatal error:  Call to undefined function webform_load() in /etc/drupal/all/modules/webform/webform.module on line 957

Line 957 of webform.module is within

  if ($node->build_mode == NODE_BUILD_PREVIEW) {
    $additions = webform_load($node);
    $node->webform['components'] = $additions->webform['components'];
  }