When using roslibjs, getting value of some params returns empty.

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Hello, I am trying to programmatically fetch params from my ROS instance using roslibjs. When fetching some params, the value returns successfully, however with other params the value returned is empty.

Here is a snippet of the code in question:

var bridge = new ROSLIB.Ros();
bridge.on('connection', onConnect);
bridge.on('error', onError);
bridge.connect('my-ros-server');

...

var param = new ROSLIB.Param({
    ros: bridge,
    name: name
});

param.get(function(value) {
    console.log(value.toString());
});