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

    [1] => _
)
)

#0 /var/www/html/app/code/core/Mage/Catalog/Model/Layer/Filter/Price.php(139): Varien_Object->__call('__toString', Array)
#1 /var/www/html/app/code/core/Mage/Catalog/Model/Layer/Filter/Price.php(139): Varien_Object->__toString(Array, '_')
#2 /var/www/html/app/code/core/Mage/Catalog/Model/Layer/Filter/Price.php(150): Mage_Catalog_Model_Layer_Filter_Price->_getCacheKey()
#3 /var/www/html/app/code/core/Mage/Catalog/Model/Layer/Filter/Abstract.php(151): Mage_Catalog_Model_Layer_Filter_Price->_getItemsData()
#4 /var/www/html/app/code/core/Mage/Catalog/Model/Layer/Filter/Abstract.php(120): Mage_Catalog_Model_Layer_Filter_Abstract->_initItems()
#5 /var/www/html/app/code/core/Mage/Catalog/Model/Layer/Filter/Abstract.php(109): Mage_Catalog_Model_Layer_Filter_Abstract->getItems()
#6 /var/www/html/app/code/core/Mage/Catalog/Block/Layer/Filter/Abstract.php(126): Mage_Catalog_Model_Layer_Filter_Abstract->getItemsCount()
#7 /var/www/html/app/code/core/Mage/Catalog/Block/Layer/View.php(144): Mage_Catalog_Block_Layer_Filter_Abstract->getItemsCount()
#8 /var/www/html/app/code/core/Mage/Catalog/Block/Layer/View.php(158): Mage_Catalog_Block_Layer_View->canShowOptions()
#9 /var/www/html/app/design/frontend/loadingzone/default/template/catalog/layer/view.phtml(34): Mage_Catalog_Block_Layer_View->canShowBlock()
#10 /var/www/html/app/code/core/Mage/Core/Block/Template.php(144): include('/var/www/html/a...')
#11 /var/www/html/app/code/core/Mage/Core/Block/Template.php(176): Mage_Core_Block_Template->fetchView('frontend/loadin...')
#12 /var/www/html/app/code/core/Mage/Core/Block/Template.php(193): Mage_Core_Block_Template->renderView()
#13 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(643): Mage_Core_Block_Template->_toHtml()
#14 /var/www/html/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#15 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(643): Mage_Core_Block_Text_List->_toHtml()
#16 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(503): Mage_Core_Block_Abstract->toHtml()
#17 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(454): Mage_Core_Block_Abstract->_getChildHtml('left', true)
#18 /var/www/html/app/design/frontend/loadingzone/default/template/page/3columns.phtml(52): Mage_Core_Block_Abstract->getChildHtml('left')
#19 /var/www/html/app/code/core/Mage/Core/Block/Template.php(144): include('/var/www/html/a...')
#20 /var/www/html/app/code/core/Mage/Core/Block/Template.php(176): Mage_Core_Block_Template->fetchView('frontend/loadin...')
#21 /var/www/html/app/code/core/Mage/Core/Block/Template.php(193): Mage_Core_Block_Template->renderView()
#22 /var/www/html/app/code/core/Mage/Core/Block/Abstract.php(643): Mage_Core_Block_Template->_toHtml()
#23 /var/www/html/app/code/core/Mage/Core/Model/Layout.php(526): Mage_Core_Block_Abstract->toHtml()
#24 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Action.php(347): Mage_Core_Model_Layout->getOutput()
#25 /var/www/html/app/code/core/Mage/Catalog/controllers/CategoryController.php(115): Mage_Core_Controller_Varien_Action->renderLayout()
#26 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Action.php(376): Mage_Catalog_CategoryController->viewAction()
#27 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(248): Mage_Core_Controller_Varien_Action->dispatch('view')
#28 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Front.php(158): Mage_Core_Controller_Varien_Router_Standard->match(Object(Mage_Core_Controller_Request_Http))
#29 /var/www/html/app/Mage.php(459): Mage_Core_Controller_Varien_Front->dispatch()
#30 /var/www/html/index.php(79): Mage::run('imprimerie')
#31 {main}