Exception when use Calendar/Month picker

[bretbas]

I have a simple StartForm with method OnInit - handler of Init event. In OnInit method i create calendar/month picker:

    private async Task OnInit(object sender, InitEventArgs ev)
    {
        MonthPicker monthPicker = new MonthPicker();
        AddControl(monthPicker);
    }

Also in StartForm i have overriden Render method with empty body.

When i started the bot, i got exception in Render method when i tried move to next/previous year:

[MajMcCloud]

Please check the example project as below: https://github.com/MajMcCloud/TelegramBotFramework/blob/master/TelegramBotBase.Test/Tests/Controls/MonthPickerForm.cs

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