we have an objects array (Angular CLI: 7.2.3,Angular: 7.2.2) that we sort by object parameter:

    users.users.sort((a, b) => 
a.first_name.localeCompare(b.first_name, 'en', {'sensitivity': 'base'}))

some of a.first_name are Null and we got "Cannot read properties of null (reading 'localeCompare')". I want to validate data during sort and let this value "" when it is null.