Notice: Undefined offset: -2 in subscriptions.module on line 872

Code affected:

function _subscriptions_get_setting($name, $account) {
...
  $uid = -DRUPAL_AUTHENTICATED_RID;
...
    foreach ($defaults[$uid] as $key => $value) {
      if ($value < 0) {  // not set, use site dft
        $defaults[$uid][$key] = $defaults[-DRUPAL_AUTHENTICATED_RID][$key]; // line 872

It happens on every node page.

Backtrace:
node_view/node_build_content/module_invoke_all/subscriptions_ui_node_view/drupal_get_form/drupal_build_form/drupal_retrieve_form/subscriptions_ui_node_form/_subscriptions_get_setting

_subscriptions_get_setting( $name = 'send_interval', $account = class stdClass { public $uid = '1'; public $name = 'admin'; ... } )	

$defaults:

&
array (size=1)
  1 => 
    array (size=13)
      'uid' => string '1' (length=1)
      'digest' => string '-1' (length=2)
      'send_interval' => string '-1' (length=2)
      'send_updates' => string '-1' (length=2)
      'send_comments' => string '-1' (length=2)
      'send_interval_visible' => string '-1' (length=2)
      'send_updates_visible' => string '-1' (length=2)
      'send_comments_visible' => string '-1' (length=2)
      'autosub_on_post' => string '-1' (length=2)
      'autosub_on_update' => string '-1' (length=2)
      'autosub_on_comment' => string '-1' (length=2)
      'send_self' => string '-1' (length=2)
      'uses_defaults' => boolean false