Cannot retrieve PublishedContent Properties

[afabri73]

Hi,
I installed the latest version of your Package on an Umbraco v11.4.0
I have this code to text functionality and this show the menu correctly.

The problem is that I would to get the icon of the Content Node to which the menu is linked (line 33) but this throw a System.ArgumentNullException: Value cannot be null. (Parameter 'source')

I tried other ways but I cannot access to Content Node properties.

Can you help me?
Thank you
Adriano