This do not solve this problem, You will have again this error.
“UI.Vision RPA is not connected to a browser tab” is random and can not be solved.
Katalon recorder have the same error, is a native error of selenium (base of ui vision RPA) and nothing can solve this.
Best solution is close crome and reopen it works.
In my case I have the same script running on 3 computers. On one it never happens. On the second it happens 3 times per day and on the third it happens every time I run it. Closing the browser and reopening fixes it temporarily.
I am wondering if AVG antivirus is the culprit. That’s the main difference between the first machine and the other two.