I'm looking at Doctor Who (1963), season 26. When getting this from the API ( https://api.themoviedb.org/3/tv/121/season/26 ), there is a node that I would imagine is invalid. It's episodes → (Index 4, "Ghost Light (1)") → crew → (Index 1):

{"job":"Writer","department":"Writing","person_id":"5886e6b0c3a3683722003a00","credit_id":"645ab8ef1b70ae00e2ace6fc"}

Note that there is no id here, which I believe to be invalid. Oddly, there is a person_id instead, though...? Is the data wrong, or is my understanding wrong?

The equivalent page on the web appears to be here, where the writer is credited as Marc Platt. Given that URL, it would appear his ID is #1455428.