Error when using devel_generate

Generating content with devel_generate produces the following error:

Notice: Undefined variable: reset in _asin_devel_generate() (line 361 of /path/to/drupal/sites/all/modules/amazon/asin/asin.module).

I found $reset here:

<?php
  if (!isset($asins) || $reset) {
    $actions = module_invoke_all('action_info');
  }
?>

But I don't see why it should be there.