node.js (socket.io) stop comunicate with client after *catch* the error

With this code where deliberately I create some error, why nodejs/socket.io stop respond to the client? Note that nodejs process still up and nothing crash nor exit.

socket.on('message', function (data) {
    var d = domain.create();

    d.on('error', function(err) {
        socket.emit('error', err.message);
    });

    d.run(function() {
        execError();
    }
});