Text was "null"

I have a problem with my code.

I got the code from a tutorial and at first it worked fine, but then it stopped working and got the error code text was "null".

Here is my code:

private static void Client_OnMessage(object sender, Telegram.Bot.Args.MessageEventArgs e)
{
    var id = e.Message.Chat.Id;
    var text = e.Message.Text;

    text = text.Split(' ')[1];      //error right here!
    switch (text)
    {
        case "now":
            var response = DateTime.Now.ToString();
            Client.SendTextMessageAsync(id, response);
            break;
    }
}

EDIT:

I tried something else and got another error, maybe im one step foward?!

System.IndexOutOfRangeException: "Index was outside the bounds of the array.

”’
var id = e.Message.Chat.Id;
var text = e.Message.Text ?? "";

        text = text.Split(' ')[1] ?? "";
        switch (text)

”’

>Solution :

change this line

var text = e.Message.Text

to

 var text = e.Message.Text ?? "";

then change

text = text.Split(' ')[1]; 

to

if(text.Split(' ').Length >= 2)
  text = text.Split(' ')[1];