Received component message for unregistered ComponentInstance!

Custom Components
1

I see this error for every instance of my custom component. I set a breakpoint on the browser and evaluated “this” to see the ComponentRegistry state.

Screenshot 2025-05-02 at 1.50.45 PM
Screenshot 2025-05-02 at 1.50.45 PM1272×338 50.2 KB

As you can see, the warning message is being printed from a ComponentRegistry that has zero elements. But then there is another ComponentRegistry that has the 3 custom components I have rendered.

I’m sure I’m calling only once to Streamlit.setComponentReady() and my components are working as expected. So this seems to be caused by Streamlit having two ComponentRegistry on the main document.

2

I’ll toss in that I’m seeing these same messages with my custom component as well. They went away after downgrading back to 1.44.1.