React app / Chrome Dev Tools strange output: "in Startnull" - main.js: 42

Question

When I launch my React application I have a strange output in the console, and I am really curious about it:

I think i could probably be missing a parameter referencing the version of the app, just need some Stackoverflow clarity. Here is my main.js where you can see the issue (line 42):

Thank you!

Answer 1

It's the Katalon Recorder Chrome Extension. If you hover over main.js tab you'll be able to see the location of the file.