--- views.page_title.inc	2011-02-24 21:06:42.000000000 -0500
+++ views.page_title.inc	2011-04-06 14:01:06.426000000 -0400
@@ -45,8 +45,10 @@
       }
     }
     // This is a view with no args provided, or the specific arg has no title - lets use the base display title
-    elseif($view->display->display_plugin == 'page_with_page_title') {
-      $pattern = $view->display->handler->get_option('page_title_pattern');
+    elseif(isset($view->display->display_plugin)) {
+      if($view->display->display_plugin == 'page_with_page_title') {
+        $pattern = $view->display->handler->get_option('page_title_pattern');
+      }
     }
   }
 }