element in unobserve(element, id) is null

The issue is reproducible in my project, tho I'm not sure how it exactly came to be. If anyone is interested into looking further into this, I can provide my project code (WPF App with Blazor).

What I did: When I have a couple of nodes in my diagram and zoom in and out further
What happens: In script.js the unobserve function fails to unobserve the given element, because it is null.

TypeError: Failed to execute 'unobserve' on 'ResizeObserver': parameter 1 is not of type 'Element'.

https://github.com/Blazor-Diagrams/Blazor.Diagrams/blob/83beefa940990bda0cb78078973fc36e50fb6ddd/src/Blazor.Diagrams/wwwroot/script.js#L42

unobserve: (element, id) =>
    {
        s.ro.unobserve(element);  //TypeError
        delete s.tracked[id];
        delete s.canvases[id];
    }

Simple, but not so thoughtful solution:

unobserve: (element, id) =>
    {
        if (element) {
            s.ro.unobserve(element);
        }
        delete s.tracked[id];
        delete s.canvases[id];
    }

I just copied the whole script.js to my project and added this additional falsy check for the parameter. I left the rest untouched.

Blazor-Diagrams / Blazor.Diagrams

element in unobserve(element, id) is null #272