Rocket.chat integration causes 'NoneType' object has no attribute 'startswith'

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I found this issue here, which seems to cause exactly the same server Output:

curl -XPOST http://localhost:5005/webhooks/rest/webhook -d ‘{“sender”: “forexample”, “text”: “hello”}’ -H "Content-type: application/json

I tried then the same, but changed “text” into “message” - and finally it Looks fine …

So, what might be wrong here? The Integration on rocket.chat side?

Thanks for some hints ! BR ANdre