Fatal error: Uncaught Error: Call to a member function isEmpty() on null in /home/filipp91/public_html/app/code/community/GetresponseIntegration/Getresponse/Model/Observer.php:424 Stack trace: #0 /home/filipp91/public_html/app/code/core/Mage/Core/Model/App.php(1358): GetresponseIntegration_Getresponse_Model_Observer->initBeforeAddToNewsletterAction(Object(Varien_Event_Observer)) #1 /home/filipp91/public_html/app/code/core/Mage/Core/Model/App.php(1337): Mage_Core_Model_App->_callObserverMethod(Object(GetresponseIntegration_Getresponse_Model_Observer), 'initBeforeAddTo...', Object(Varien_Event_Observer)) #2 /home/filipp91/public_html/app/Mage.php(448): Mage_Core_Model_App->dispatchEvent('model_save_afte...', Array) #3 /home/filipp91/public_html/app/code/core/Mage/Core/Model/Abstract.php(465): Mage::dispatchEvent('model_save_afte...', Array) #4 /home/filipp91/public_html/app/code/core/Mage/Core/Model/Abstract.php(319): Mage_Core_Model_Abstract->_afterSave() #5 /home/filipp91/public_html/app/code/core/Mage/Reports/Model/Event in /home/filipp91/public_html/app/code/community/GetresponseIntegration/Getresponse/Model/Observer.php on line 424