Python Tutor button causes an error message.

When I click on the Just Code button from the home page and get sent to the in-browser editor, I then click on the green Python Tutor button and I am sent to https://pythontutor.com/iframe-embed.html#code=&codeDivHeight=600&codeDivWidth=600&cumulative=false&curInstr=0&heapPrimitives=false&origin=opt-frontend.js&py=3&rawInputLstJSON=%5B%5D&textReferences=false and get the alert "ERROR! no code or langauge specified in iframe embed URL string"

(I'm using English on the futurecoder.io site.)