I ran this command to run Grafana 4.4.2:
docker run -d --name=grafana442 -p 3003:3000 grafana/grafana:4.4.2
Went to http://localhost:3003 with Chrome, logged in, created a dashboard with a text panel and did not get an error.
If you test in incognito mode, do you get an error? Maybe it is a Chrome plugin (uBlock or similar)? Do you get the same error in Firefox?