Unecessary call to CRM_Member_BAO_Membership::getContributionPageId sometimes fails

CRM_Member_BAO_Membership::postProcessMembership makes an unnecessary call to CRM_Member_BAO_Membership::getContributionPageId and occasionally it will fail (not quite sure why, I do notice that the SQL statement in that function is poorly written). The simple solution is to use the value that is already present in $form->_values['id']. Also attached is an error report that describes what happens when the ID lookup fails (you get a completely unrelated error).