You cannot define a correlation name 'size_idx' more than once

#0 /home/salylimon/public_html/lib/Varien/Db/Select.php(281): Zend_Db_Select->_join('inner join', Array, 'size_idx.entity...', Array, NULL)
#1 /home/salylimon/public_html/app/code/core/Zend/Db/Select.php(352): Varien_Db_Select->_join('inner join', Array, 'size_idx.entity...', Array, NULL)
#2 /home/salylimon/public_html/app/code/core/Zend/Db/Select.php(331): Zend_Db_Select->joinInner(Array, 'size_idx.entity...', Array, NULL)
#3 /home/salylimon/public_html/app/code/core/Mage/Catalog/Model/Resource/Layer/Filter/Attribute.php(70): Zend_Db_Select->join(Array, 'size_idx.entity...', Array)
#4 /home/salylimon/public_html/app/code/core/Mage/Catalog/Model/Layer/Filter/Attribute.php(94): Mage_Catalog_Model_Resource_Layer_Filter_Attribute->applyFilterToCollection(Object(Mage_Catalog_Model_Layer_Filter_Attribute), '21')
#5 /home/salylimon/public_html/app/code/core/Mage/Catalog/Block/Layer/Filter/Abstract.php(91): Mage_Catalog_Model_Layer_Filter_Attribute->apply(Object(Mage_Core_Controller_Request_Http), Object(Mage_Catalog_Block_Layer_Filter_Attribute))
#6 /home/salylimon/public_html/app/code/core/Mage/Catalog/Block/Layer/Filter/Abstract.php(73): Mage_Catalog_Block_Layer_Filter_Abstract->_initFilter()
#7 /home/salylimon/public_html/app/code/core/Mage/Catalog/Block/Layer/View.php(136): Mage_Catalog_Block_Layer_Filter_Abstract->init()
#8 /home/salylimon/public_html/app/code/core/Mage/Core/Block/Abstract.php(293): Mage_Catalog_Block_Layer_View->_prepareLayout()
#9 /home/salylimon/public_html/app/code/core/Mage/Core/Model/Layout.php(456): Mage_Core_Block_Abstract->setLayout(Object(Mage_Core_Model_Layout))
#10 /home/salylimon/public_html/app/design/frontend/default/salylimon/template/catalog/category/view.phtml(83): Mage_Core_Model_Layout->createBlock('catalog/layer_v...')
#11 /home/salylimon/public_html/app/code/core/Mage/Core/Block/Template.php(241): include('/home/salylimon...')
#12 /home/salylimon/public_html/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/defaul...')
#13 /home/salylimon/public_html/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#14 /home/salylimon/public_html/app/code/core/Mage/Core/Block/Abstract.php(919): Mage_Core_Block_Template->_toHtml()
#15 /home/salylimon/public_html/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#16 /home/salylimon/public_html/app/code/core/Mage/Core/Block/Abstract.php(919): Mage_Core_Block_Text_List->_toHtml()
#17 /home/salylimon/public_html/app/code/core/Mage/Core/Block/Abstract.php(637): Mage_Core_Block_Abstract->toHtml()
#18 /home/salylimon/public_html/app/code/core/Mage/Core/Block/Abstract.php(581): Mage_Core_Block_Abstract->_getChildHtml('content', true)
#19 /home/salylimon/public_html/app/design/frontend/default/salylimon/template/page/1column.phtml(48): Mage_Core_Block_Abstract->getChildHtml('content')
#20 /home/salylimon/public_html/app/code/core/Mage/Core/Block/Template.php(241): include('/home/salylimon...')
#21 /home/salylimon/public_html/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/defaul...')
#22 /home/salylimon/public_html/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#23 /home/salylimon/public_html/app/code/core/Mage/Core/Block/Abstract.php(919): Mage_Core_Block_Template->_toHtml()
#24 /home/salylimon/public_html/app/code/core/Mage/Core/Model/Layout.php(555): Mage_Core_Block_Abstract->toHtml()
#25 /home/salylimon/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(390): Mage_Core_Model_Layout->getOutput()
#26 /home/salylimon/public_html/app/code/core/Mage/Catalog/controllers/CategoryController.php(161): Mage_Core_Controller_Varien_Action->renderLayout()
#27 /home/salylimon/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Catalog_CategoryController->viewAction()
#28 /home/salylimon/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view')
#29 /home/salylimon/public_html/app/code/core/Mage/Core/Controller/Varien/Front.php(172): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#30 /home/salylimon/public_html/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#31 /home/salylimon/public_html/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#32 /home/salylimon/public_html/index.php(82): Mage::run('', 'store')
#33 {main}