title: Error Magento 1.9 - You cannot define a correlation name 'ce' more than once
body: <p>I am facing the following error after installing new theme,</p>
  
  <p>There has been an error processing your request
  You cannot define a correlation name 'ce' more than once</p>
  
  <p>Trace:</p>
  
  <pre><code>#0 /var/www/html/mage/lib/Varien/Db/Select.php(281): Zend_Db_Select-&gt;_join('left join', 'catalog_product...', 'ce.entity_id=e....', NULL, NULL)
  #1 /var/www/html/mage/lib/Zend/Db/Select.php(357): Varien_Db_Select-&gt;_join('left join', 'catalog_product...', 'ce.entity_id=e....', NULL, NULL)
  #2 /var/www/html/mage/app/code/community/Cybage/Marketplace/Block/Catalog/Product/List.php(53): Zend_Db_Select-&gt;joinLeft('catalog_product...', 'ce.entity_id=e....', NULL)
  #3 /var/www/html/mage/app/code/core/Mage/Catalog/Block/Product/List.php(120): Cybage_Marketplace_Block_Catalog_Product_List-&gt;_getProductCollection()
  #4 /var/www/html/mage/app/code/local/Magentothem/Layerednavigationajax/controllers/CategoryController.php(65): Mage_Catalog_Block_Product_List-&gt;getLoadedProductCollection()
  #5 /var/www/html/mage/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Magentothem_Layerednavigationajax_CategoryController-&gt;viewAction()
  #6 /var/www/html/mage/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(250): Mage_Core_Controller_Varien_Action-&gt;dispatch('view')
  #7 /var/www/html/mage/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard-&gt;match(Object(Mage_Core_Controller_Request_Http))
  #8 /var/www/html/mage/app/code/core/Mage/Core/Model/App.php(354): Mage_Core_Controller_Varien_Front-&gt;dispatch()
  #9 /var/www/html/mage/app/Mage.php(684): Mage_Core_Model_App-&gt;run(Array)
  #10 /var/www/html/mage/index.php(87): Mage::run('', 'store')
  #11 {main}
  </code></pre>
  
  <p>Error log record number: 670450388037</p>