Many E_NOTICEs on $view default_display

I created several views today and started to get many undefined property in my logs. The problem appears on this one line that checks the default_display. Just wondering whether you were aware of such problems?

        if (!$view_checked) {
          $h = $view->display[$boost['page_id']]->handler->default_display->options;

Note that I use views 3.x. Is there something I can do to help determine why this would be happening?

Thank you.
Alexis Wilke