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

#0 /home/mcconnel/public_html/lib/Varien/Db/Select.php(281): Zend_Db_Select->_join('inner join', Array, 'color_idx.entit...', Array, NULL)
#1 /home/mcconnel/public_html/app/code/core/Zend/Db/Select.php(352): Varien_Db_Select->_join('inner join', Array, 'color_idx.entit...', Array, NULL)
#2 /home/mcconnel/public_html/app/code/core/Zend/Db/Select.php(331): Zend_Db_Select->joinInner(Array, 'color_idx.entit...', Array, NULL)
#3 /home/mcconnel/public_html/app/code/local/Mango/Attributemapping/Model/Mysql4/Catalog/Layer/Filter/Parent.php(66): Zend_Db_Select->join(Array, 'color_idx.entit...', Array)
#4 /home/mcconnel/public_html/app/code/local/Mango/Attributemapping/Model/Catalog/Layer/Filter/Parent.php(100): Mango_Attributemapping_Model_Mysql4_Catalog_Layer_Filter_Parent->applyFilterToCollection(Object(Mango_Attributemapping_Model_Catalog_Layer_Filter_Parent), Array)
#5 /home/mcconnel/public_html/app/code/core/Mage/Catalog/Block/Layer/Filter/Abstract.php(91): Mango_Attributemapping_Model_Catalog_Layer_Filter_Parent->apply(Object(Mage_Core_Controller_Request_Http), Object(Mango_Attributemapping_Block_Catalog_Layer_Filter_Parent))
#6 /home/mcconnel/public_html/app/code/core/Mage/Catalog/Block/Layer/Filter/Abstract.php(73): Mage_Catalog_Block_Layer_Filter_Abstract->_initFilter()
#7 /home/mcconnel/public_html/app/code/local/Mango/Attributemapping/Model/Observer.php(28): Mage_Catalog_Block_Layer_Filter_Abstract->init()
#8 /home/mcconnel/public_html/app/code/core/Mage/Core/Model/App.php(1358): Mango_Attributemapping_Model_Observer->templateForLayeredNavigationFilter(Object(Varien_Event_Observer))
#9 /home/mcconnel/public_html/app/code/core/Mage/Core/Model/App.php(1337): Mage_Core_Model_App->_callObserverMethod(Object(Mango_Attributemapping_Model_Observer), 'templateForLaye...', Object(Varien_Event_Observer))
#10 /home/mcconnel/public_html/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('core_block_abst...', Array)
#11 /home/mcconnel/public_html/app/code/core/Mage/Core/Block/Abstract.php(298): Mage::dispatchEvent('core_block_abst...', Array)
#12 /home/mcconnel/public_html/app/code/core/Mage/Core/Model/Layout.php(456): Mage_Core_Block_Abstract->setLayout(Object(Mage_Core_Model_Layout))
#13 /home/mcconnel/public_html/app/code/core/Mage/Core/Model/Layout.php(472): Mage_Core_Model_Layout->createBlock('catalog/layer_v...', 'catalog.leftnav')
#14 /home/mcconnel/public_html/app/code/core/Mage/Core/Model/Layout.php(239): Mage_Core_Model_Layout->addBlock('catalog/layer_v...', 'catalog.leftnav')
#15 /home/mcconnel/public_html/app/code/core/Mage/Core/Model/Layout.php(205): Mage_Core_Model_Layout->_generateBlock(Object(Mage_Core_Model_Layout_Element), Object(Mage_Core_Model_Layout_Element))
#16 /home/mcconnel/public_html/app/code/core/Mage/Core/Model/Layout.php(210): Mage_Core_Model_Layout->generateBlocks(Object(Mage_Core_Model_Layout_Element))
#17 /home/mcconnel/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(344): Mage_Core_Model_Layout->generateBlocks()
#18 /home/mcconnel/public_html/app/code/core/Mage/Catalog/controllers/CategoryController.php(148): Mage_Core_Controller_Varien_Action->generateLayoutBlocks()
#19 /home/mcconnel/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Catalog_CategoryController->viewAction()
#20 /home/mcconnel/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('view')
#21 /home/mcconnel/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))
#22 /home/mcconnel/public_html/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#23 /home/mcconnel/public_html/app/Mage.php(684): Mage_Core_Model_App->run(Array)
#24 /home/mcconnel/public_html/index.php(86): Mage::run('', 'store')
#25 {main}