Why does an error occur when running GeckoFX + SocketIoClientDotNet?

Question

C++ / C#

1. I connect to the socket.io server on node js (everything goes. I need this to allow the server to run the form with the browser)
2. The GeckoFX browser loads and opens the page.
3. I need to know by the "message" event whether there is a block with a certain id on the page

{
             ................какой то код............
             socket.On("message",()=>Gerr(_webBrowser)); //пробовал и без передачи браузера
        }
        public void Gerr(GeckoWebBrowser wb)
        {
            var grr = wb.Document.GetElementById("idm"); //тут вылетает исключение
            .......................
        }

Throws an exception for some reason:
Unhandled exception of type 'System.InvalidCastException' in Geckofx-Winforms.dll
Additional information: Cannot cast COM object of type 'System.__ComObject' to interface type 'Gecko.nsIWebBrowser'. The operation failed because a call to QueryInterface on a COM component for interface with IID "{33E9D001-CAAB-4BA9-8961-54902F197202}" returned the following error: Interface not supported (Exception from HRESULT: 0x80004002 (E_NOINTERFACE)).
And if I scroll the transition to another page:
wb.Navigate("https://yandex.ru");
Goes to the page without further ado.
Does anyone know why this thing is happening and how to defeat it?