[bug-OpenMage#2] Possible NPE with breadcrumbs in Mage_Cms_Block_Page::_prepareLayout()

Author: drobinson

app/code/core/Mage/Cms/Block/Page.php

@@ -64,6 +64,7 @@ protected function _prepareLayout()
     {
         $page = $this->getPage();
         $breadcrumbsArray = array();
+        $breadcrumbs = null;
 
         // show breadcrumbs
         if (Mage::getStoreConfig('web/default/show_cms_breadcrumbs')
@@ -90,8 +91,10 @@ protected function _prepareLayout()
 
             Mage::dispatchEvent('cms_generate_breadcrumbs', array('breadcrumbs' => $breadcrumbsObject));
 
-            foreach ($breadcrumbsObject->getCrumbs() as $breadcrumbsItem) {
-                $breadcrumbs->addCrumb($breadcrumbsItem['crumbName'], $breadcrumbsItem['crumbInfo']);
+            if ($breadcrumbs instanceof Mage_Page_Block_Html_Breadcrumbs) {
+                foreach ($breadcrumbsObject->getCrumbs() as $breadcrumbsItem) {
+                    $breadcrumbs->addCrumb($breadcrumbsItem['crumbName'], $breadcrumbsItem['crumbInfo']);
+                }
             }
         }