\Mage_Customer_Model_Customer::getGroupId returns the default customer group ID if the customer is not logged in. Hence, for not logged in customers, the default customer group is currently tracked. Instead, "not logged in" needs to be tracked in this case.
\Mage_Customer_Model_Customer::getGroupId
returns the default customer group ID if the customer is not logged in. Hence, for not logged in customers, the default customer group is currently tracked. Instead, "not logged in" needs to be tracked in this case.