SignalR client method is not executing everytime while displaying a stream of messages.

I need to display a stream of message. The client method DisplayMessage is not executing everytime. But when I put debugger in the client code, it executes everytime. Here is my client code.

        chat.client.displayMessage = function (data) {
        // Html encode display data
        debugger;

        var encodedData = $('<div />').text(data.GPSPosition).html();
        $('#discussion').append('<li>' + encodedData + '</li>');

}

how can i display a stream of messages? Why it is only working with debugger?

Here is my server code. I am calling client method from a class outside the hub class.

        IHubContext hubContext = GlobalHost.ConnectionManager.GetHubContext<AzureGuidanceEventHubReceiver>();
       hubContext.Clients.All.DisplayMessage(newData);