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Topmenu not functioning after upgrade magento 1.8 fatal error addCacheTag()

ERROR :: Fatal error: Call to a member function addCacheTag() on a non-object in public_html/app/code/core/Mage/Catalog/Model/Observer.php on line 215

you can find the lines

241 ::  $menuBlock->addModelTags($categoryModel);

215 ::  $block->addCacheTag(Mage_Catalog_Model_Category::CACHE_TAG);

here is not error fixing place in block class is

"Mage_Page_Block_Html_Topmenu"
you can find getHtml function in that you can see

 Mage::dispatchEvent('page_block_html_topmenu_gethtml_before', array(
            'menu' => $this->_menu

        ));
replace above code to below code 

 Mage::dispatchEvent('page_block_html_topmenu_gethtml_before', array(
        'menu' => $this->_menu,
        'block' => $this         //add this line

));

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