User existence check

in version 24.4 isuseractive function is not available, is there any other way to achieve this? I just want to validate if user is acitve or deactivated or even if doesn't exist anymore in the system, we are trying to validate the scenario if for any reason the user saved in DB was deactived or deleted from the system, cause currently we are saving the result of calling the funcion loggedInUser() in DB, this is storing a text value, however we have the requirement to display the fisrtName and lastName of the user in the frontend, therefore we would like to catch the invalid user exception assuming the user was deactivated, since we don't have a try-catch similiar function in version 24.4, we want to know if there is any other way to catch the exception or change the approach following your recomendations. Any help will be greatly appreciated, thanks and regards!

in version 24.4 isuseractive function is not available, is there any other way to achieve this? I just want to validate if user is acitve or deactivated or even if doesn't exist anymore in the system, we are trying to validate the scenario if for any reason the user saved in DB was deactived or deleted from the system, cause currently we are saving the result of calling the funcion loggedInUser() in DB, this is storing a text value, however we have the requirement to display the fisrtName and lastName of the user in the frontend, therefore we would like to catch the invalid user exception assuming the user was deactivated, since we don't have a try-catch similiar function in version 24.4, we want to know if there is any other way to catch the exception or change the approach following your recomendations. Any help will be greatly appreciated, thanks and regards!