bug: after recompiling, the current open tab is closed if an error occured in between

[TheAlexLichter]

1. Open the REPL
2. Click on "index2.js" on the right pane
3. Write the start of code that causes an error, e.g. const a =
4. Finish the code with const a = 2

Expected: The tab should be index2.js where it has been before
Actual: See that the tab is now index.js, the first tab.