Unable to get tracks of certain users

[ssalka]

I have the following, which is triggered by submitting an angular form containing a text input for a permalink:

scope.search = function() {
    let url = baseUrl + scope.input.permalink;
    SC.get('/resolve', {url: url, client_id: client_id})
        .then(function(user) {
            SC.get('/users/' + user.id + '/tracks')
                .then(function(tracks) {
                    let n = Math.min(10, tracks.length);
                    tracks.slice(0,n).map(
                        (track) => console.log(track.title)
                    );
                });
        });
};

The code is meant to resolve the permalink to a user ID, then grab that user's latest 10 tracks (if there are that many) and log the titles. It works for most users, but sometimes fails, e.g. for permalink "feedme". Not sure why it won't work for particular users, I can't see any reason for it in the API docs/reference or the source code.

Thanks in advance for any feedback or ideas!