topic_id is NaN

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<img width="244" height="77" alt="Image" src="https://github.com/user-attachments/assets/42eb48fb-6355-4cee-bb49-0d76f8a5d3d8" />

I am on a Mac system. With the corpus of 223,131, the majority of topics are NaN. Anyone experienced this?
I used the default embedding model, not changing any parameters.