Warning from DOM, can I get more details about the warning? - html

I have a little web-site project going on, and I'm trying to remove leftover warnings from CSS and JS.
Now I got this warning "Expected color but found 'undefined' > from DOM" and that's it.
I don't know where to look for more details or if there are any at all. I'm using mainly Firefox and when I look in the Chrome DevTool nothing comes up.
I looked up some stuff, but couldn't find anything about getting more details about DOM warnings.
PLS Help

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