Fatal error: Uncaught TypeError: Argument 1 passed to Magento\Framework\Mail\AddressConverter::convertMany() must be of the type array, null given, called in /home/cbuyhub/public_html/vendor/magento/framework/Mail/Template/TransportBuilder.php on line 426 and defined in /home/cbuyhub/public_html/vendor/magento/framework/Mail/AddressConverter.php:59 Stack trace: #0 /home/cbuyhub/public_html/vendor/magento/framework/Mail/Template/TransportBuilder.php(426): Magento\Framework\Mail\AddressConverter->convertMany(NULL) #1 /home/cbuyhub/public_html/vendor/magento/framework/Mail/Template/TransportBuilder.php(202): Magento\Framework\Mail\Template\TransportBuilder->addAddressByType('to', NULL, '') #2 /home/cbuyhub/public_html/generated/code/Magento/Framework/Mail/Template/TransportBuilder/Interceptor.php(37): Magento\Framework\Mail\Template\TransportBuilder->addTo(NULL, '') #3 /home/cbuyhub/public_html/app/code/Webkul/AdvanceSeoManager/Observer/Pageobserver.php(75): Magento\Framework\Mail\Template\TransportBuilder\Interceptor->addTo in /home/cbuyhub/public_html/vendor/magento/framework/Mail/AddressConverter.php on line 59