after migrating magento site to aws ec2 I got Undefined index: items in /var/www/html/app/code/core/Mage/Page/Block/Html/Head.php on line 166

I have migrated my magento site from shared hosting to aws ec2 ubuntu server. I have done database import successfully. But when I hit public IP of ec2 server. I got Undefined index: items in /var/www/html/app/code/core/Mage/Page/Block/Html/Head.php on line 166

Notice: Undefined index: items in /var/www/html/app/code/core/Mage/Page/Block/Html/Head.php on line 166

please give suggestion to fix these issue