Invalid method Varien_Object::__toString(Array
(
    [0] => Array
        (
        )

    [1] => _
)
)
Trace:
#0 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Catalog/Model/Layer/Filter/Price.php(138): Varien_Object->__call('__toString', Array)
#1 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Catalog/Model/Layer/Filter/Price.php(138): Varien_Object->__toString(Array, '_')
#2 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Catalog/Model/Layer/Filter/Price.php(149): Mage_Catalog_Model_Layer_Filter_Price->_getCacheKey()
#3 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Catalog/Model/Layer/Filter/Abstract.php(141): Mage_Catalog_Model_Layer_Filter_Price->_getItemsData()
#4 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Catalog/Model/Layer/Filter/Abstract.php(110): Mage_Catalog_Model_Layer_Filter_Abstract->_initItems()
#5 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Catalog/Model/Layer/Filter/Abstract.php(99): Mage_Catalog_Model_Layer_Filter_Abstract->getItems()
#6 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Catalog/Block/Layer/Filter/Abstract.php(101): Mage_Catalog_Model_Layer_Filter_Abstract->getItemsCount()
#7 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/design/frontend/default/default/template/catalog/layer/view.phtml(48): Mage_Catalog_Block_Layer_Filter_Abstract->getItemsCount()
#8 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Block/Template.php(144): include('/var/www/vhosts...')
#9 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Block/Template.php(176): Mage_Core_Block_Template->fetchView('frontend/defaul...')
#10 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Block/Template.php(193): Mage_Core_Block_Template->renderView()
#11 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Block/Abstract.php(643): Mage_Core_Block_Template->_toHtml()
#12 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#13 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Block/Abstract.php(643): Mage_Core_Block_Text_List->_toHtml()
#14 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Block/Abstract.php(503): Mage_Core_Block_Abstract->toHtml()
#15 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Block/Abstract.php(454): Mage_Core_Block_Abstract->_getChildHtml('left', true)
#16 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/design/frontend/default/default/template/page/3columns.phtml(52): Mage_Core_Block_Abstract->getChildHtml('left')
#17 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Block/Template.php(144): include('/var/www/vhosts...')
#18 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Block/Template.php(176): Mage_Core_Block_Template->fetchView('frontend/defaul...')
#19 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Block/Template.php(193): Mage_Core_Block_Template->renderView()
#20 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Block/Abstract.php(643): Mage_Core_Block_Template->_toHtml()
#21 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Model/Layout.php(525): Mage_Core_Block_Abstract->toHtml()
#22 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Controller/Varien/Action.php(325): Mage_Core_Model_Layout->getOutput()
#23 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/CatalogSearch/controllers/ResultController.php(79): Mage_Core_Controller_Varien_Action->renderLayout()
#24 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Controller/Varien/Action.php(348): Mage_CatalogSearch_ResultController->indexAction()
#25 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(163): Mage_Core_Controller_Varien_Action->dispatch('index')
#26 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/code/core/Mage/Core/Controller/Varien/Front.php(174): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#27 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/app/Mage.php(450): Mage_Core_Controller_Varien_Front->dispatch()
#28 /var/www/vhosts/coffeemachinedescaling.com.au/httpdocs/index.php(52): Mage::run()
#29 {main}