System Settings Form function variable missing

When trying to view the settings page PHP is spitting PHP Warning: Missing argument 2 for system_settings_form(), called in /var/www/vhosts/drupal-47/modules/views_alpha_pager/views_alpha_pager.module on line 23 and defined in /var/www/vhosts/drupal-47/modules/system.module on line 747

Suggested change:

function views_alpha_pager_settings() {
  $form['views_alpha_pager_ignore'] = array(
    '#type' => 'textfield',
    '#title' => t('Ignore Leading Words'),
    '#default_value' => variable_get('views_alpha_pager_ignore', t('a the and')),
    '#description' => t('When sorting, ignore leading common words'),
  );
  return system_settings_form('views_alpha_pager_settings_form', $form);
}