No date part in '' found.

#0 /var/www/html/lib/Zend/Date.php(1077): Zend_Date->_calculate('set', false, NULL, 'en_GB')
#1 /var/www/html/lib/Zend/Date.php(197): Zend_Date->set(false, NULL, 'en_GB')
#2 /var/www/html/app/code/core/Mage/Core/Model/Locale.php(474): Zend_Date->__construct(false, NULL, Object(Zend_Locale))
#3 /var/www/html/app/code/core/Mage/Core/Model/Date.php(169): Mage_Core_Model_Locale->date(false)
#4 /var/www/html/app/code/core/Mage/Core/Model/Date.php(126): Mage_Core_Model_Date->timestamp(false)
#5 /var/www/html/app/code/community/Fishpig/Wordpress/Helper/Data.php(136): Mage_Core_Model_Date->date('g', false)
#6 /var/www/html/app/code/community/Fishpig/Wordpress/Helper/Data.php(152): Fishpig_Wordpress_Helper_Data->formatDate(1495662017, 'g:i a')
#7 /var/www/html/app/code/community/Fishpig/Wordpress/Addon/WordPressSEO/Helper/Data.php(385): Fishpig_Wordpress_Helper_Data->formatTime(1495662017)
#8 /var/www/html/app/code/community/Fishpig/Wordpress/Addon/WordPressSEO/Helper/Data.php(163): Fishpig_Wordpress_Addon_WordPressSEO_Helper_Data->getRewriteData()
#9 /var/www/html/app/code/community/Fishpig/Wordpress/Addon/WordPressSEO/Helper/Data.php(136): Fishpig_Wordpress_Addon_WordPressSEO_Helper_Data->_applyPostPageLogic(Object(Fishpig_Wordpress_Model_Post))
#10 [internal function]: Fishpig_Wordpress_Addon_WordPressSEO_Helper_Data->processRouteWordPressPostView(Object(Fishpig_Wordpress_Model_Post))
#11 /var/www/html/app/code/community/Fishpig/Wordpress/Helper/Plugin/Seo/Abstract.php(58): call_user_func(Array, Object(Fishpig_Wordpress_Model_Post))
#12 /var/www/html/app/code/core/Mage/Core/Model/App.php(1229): Fishpig_Wordpress_Helper_Plugin_Seo_Abstract->injectSeoObserver(Object(Varien_Event_Observer))
#13 /var/www/html/app/code/core/Mage/Core/Model/App.php(1210): Mage_Core_Model_App->_callObserverMethod(Object(Fishpig_Wordpress_Addon_WordPressSEO_Helper_Data), 'injectSeoObserv...', Object(Varien_Event_Observer))
#14 /var/www/html/app/Mage.php(418): Mage_Core_Model_App->dispatchEvent('wordpress_rende...', Array)
#15 /var/www/html/app/code/community/Fishpig/Wordpress/Controller/Abstract.php(124): Mage::dispatchEvent('wordpress_rende...', Array)
#16 /var/www/html/app/code/community/Fishpig/Wordpress/controllers/PostController.php(53): Fishpig_Wordpress_Controller_Abstract->renderLayout()
#17 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Action.php(418): Fishpig_Wordpress_PostController->viewAction()
#18 /var/www/html/app/code/community/Fishpig/Wordpress/Controller/Router/Abstract.php(174): Mage_Core_Controller_Varien_Action->dispatch('view')
#19 /var/www/html/app/code/community/Fishpig/Wordpress/Controller/Router/Abstract.php(101): Fishpig_Wordpress_Controller_Router_Abstract->_dispatch()
#20 /var/www/html/app/code/core/Mage/Core/Controller/Varien/Front.php(176): Fishpig_Wordpress_Controller_Router_Abstract->match(Object(Mage_Core_Controller_Request_Http))
#21 /var/www/html/app/code/core/Mage/Core/Model/App.php(304): Mage_Core_Controller_Varien_Front->dispatch()
#22 /var/www/html/app/Mage.php(598): Mage_Core_Model_App->run(Array)
#23 /var/www/html/index.php(89): Mage::run('default', 'store')
#24 {main}