diff --git a/core/modules/system/system.module b/core/modules/system/system.module
index 5c327f7..50ebd3c 100644
--- a/core/modules/system/system.module
+++ b/core/modules/system/system.module
@@ -816,8 +816,10 @@ function system_preprocess_block(&$variables) {
 
     case 'system_page_title_block':
       $variables['title'] = '';
-      if($variables['content']['title']['#markup']) {
+      if(property_exists($variables['content']['title'], 'markup') && $variables['content']['title']['#markup']) {
         $variables['title'] = $variables['content']['title']['#markup'];
+      } else if ($variables['content']['title']) {
+        $variables['title'] = $variables['content']['title'];
       }
       break;
   }