last_updated is broken

Hello,

I hope this issue is not yet report...

I have a problem with the topic list of forums. The list is empty unless I click on a sort.

I suppose it is about the View advanced_forum_topic_list because a field is broken :

/* Field: Broken/missing handler */
$handler->display->display_options['fields']['last_updated']['id'] = 'last_updated';
$handler->display->display_options['fields']['last_updated']['table'] = 'node_comment_statistics';
$handler->display->display_options['fields']['last_updated']['field'] = 'last_updated';