Warning: array_keys() expects parameter 1 to be array, null given  in /srv/public_html/app/design/frontend/smartwave/porto/template/pws_productpartsdiagram/list.phtml on line 54

#0 [internal function]: mageCoreErrorHandler(2, 'array_keys() ex...', '/srv/public_htm...', 54, Array)
#1 /srv/public_html/app/design/frontend/smartwave/porto/template/pws_productpartsdiagram/list.phtml(54): array_keys(NULL)
#2 /srv/public_html/app/code/core/Mage/Core/Block/Template.php(241): include('/srv/public_htm...')
#3 /srv/public_html/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/smartw...')
#4 /srv/public_html/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#5 /srv/public_html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Template->_toHtml()
#6 /srv/public_html/app/code/core/Mage/Core/Block/Abstract.php(641): Mage_Core_Block_Abstract->toHtml()
#7 /srv/public_html/app/code/core/Mage/Core/Block/Abstract.php(585): Mage_Core_Block_Abstract->_getChildHtml('product_additio...', false)
#8 /srv/public_html/app/design/frontend/smartwave/porto/template/catalog/product/view.phtml(189): Mage_Core_Block_Abstract->getChildHtml('product_additio...', false)
#9 /srv/public_html/app/code/core/Mage/Core/Block/Template.php(241): include('/srv/public_htm...')
#10 /srv/public_html/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/smartw...')
#11 /srv/public_html/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#12 /srv/public_html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Template->_toHtml()
#13 /srv/public_html/app/code/core/Mage/Core/Block/Text/List.php(43): Mage_Core_Block_Abstract->toHtml()
#14 /srv/public_html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Text_List->_toHtml()
#15 /srv/public_html/app/code/core/Mage/Core/Block/Abstract.php(641): Mage_Core_Block_Abstract->toHtml()
#16 /srv/public_html/app/code/core/Mage/Core/Block/Abstract.php(585): Mage_Core_Block_Abstract->_getChildHtml('content', true)
#17 /srv/public_html/app/design/frontend/smartwave/porto/template/page/1column.phtml(95): Mage_Core_Block_Abstract->getChildHtml('content')
#18 /srv/public_html/app/code/core/Mage/Core/Block/Template.php(241): include('/srv/public_htm...')
#19 /srv/public_html/app/code/core/Mage/Core/Block/Template.php(272): Mage_Core_Block_Template->fetchView('frontend/smartw...')
#20 /srv/public_html/app/code/core/Mage/Core/Block/Template.php(286): Mage_Core_Block_Template->renderView()
#21 /srv/public_html/app/code/core/Mage/Core/Block/Abstract.php(923): Mage_Core_Block_Template->_toHtml()
#22 /srv/public_html/app/code/core/Mage/Core/Model/Layout.php(555): Mage_Core_Block_Abstract->toHtml()
#23 /srv/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(390): Mage_Core_Model_Layout->getOutput()
#24 /srv/public_html/app/code/core/Mage/Cms/Helper/Page.php(137): Mage_Core_Controller_Varien_Action->renderLayout()
#25 /srv/public_html/app/code/core/Mage/Cms/Helper/Page.php(52): Mage_Cms_Helper_Page->_renderPage(Object(Mage_Cms_IndexController), 'no-route')
#26 /srv/public_html/app/code/core/Mage/Cms/controllers/IndexController.php(75): Mage_Cms_Helper_Page->renderPage(Object(Mage_Cms_IndexController), 'no-route')
#27 /srv/public_html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Mage_Cms_IndexController->noRouteAction()
#28 /srv/public_html/app/code/core/Mage/Core/Controller/Varien/Router/Standard.php(254): Mage_Core_Controller_Varien_Action->dispatch('noRoute')
#29 /srv/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 /srv/public_html/app/code/core/Mage/Core/Model/App.php(365): Mage_Core_Controller_Varien_Front->dispatch()
#31 /srv/public_html/app/Mage.php(686): Mage_Core_Model_App->run(Array)
#32 /srv/public_html/index.php(83): Mage::run('', 'store')
#33 {main}