I updated yesterday to 1.9 CE and now my category pages I get this fatal error:

Fatal error: Call to undefined method Mage_Catalog_Model_Resource_Category_Flat_Collection::joinUrlRewrite() in /home/senorehe/public_html/app/code/local/Mage/Catalog/Block/Navigation.php on line 155

This is the section it is referring to

public function getCurrentChildCategories()
        $layer = Mage::getSingleton('catalog/layer');
        $category   = $layer->getCurrentCategory();
        /* @var $category Mage_Catalog_Model_Category */
        $collection = Mage::getModel('catalog/category')->getCollection();
        /* @var $collection Mage_Catalog_Model_Resource_Eav_Mysql4_Category_Collection */
            ->addAttributeToFilter('is_active', 1)
            ->setOrder('position', 'ASC')
line 155        ->joinUrlRewrite()

        $productCollection = Mage::getResourceModel('catalog/product_collection');
        return $collection;

I have tried reindexing the URL, flushing my mage_core_url_rewrite then reindexing. But nothing had worked so far.

Can anybody help me with this?

  • Just a prompt idea: did you reindex all your data after the update? Jun 3, 2014 at 10:36
  • yea and everything was working fine until about an hour ago
    – Adam Allen
    Jun 3, 2014 at 10:37
  • Ensure you have no duplicate url_keys, you can use this query to check. SELECT url_key, COUNT(url_key) AS NumOccurrences FROM catalog_product_flat_1 GROUP BY url_key HAVING ( COUNT(url_key) > 1 ); And make sure you read the upgrade docs Jun 3, 2014 at 11:08

3 Answers 3


I have changed ->joinUrlRewrite() into ->addUrlRewriteToResult(). This has worked for me.

  • Any idea why that worked? I see the difference between the two function. Is the category flat still working as intended? Jan 15, 2018 at 0:12

I fixed the problem, for some reason when I disabled the flat catalog product and flat catalog category. The problem went away. I don't understand the fix but it worked.

  • If your store has many products, it's a good practice to keep flat category enabled. Mar 27, 2015 at 14:03
  • I see the said a lot of places but why is that?
    – Adam Allen
    Mar 27, 2015 at 14:18
  • In my case it looks like to be a reindexing problem while we have many API requests. We are trying to figure out. Mar 27, 2015 at 17:56

It's a strange answer, but try checking your cpu load. I had a problem like this when cleanned the entire cache of a store.

It took some hours to get back to normal with no changes in config or code.

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