TYPO3 Core

I've a v11.5.5 instance, hosted in a country far far away from my location, possibly with a not brilliant internet connection.

Whenever I log-in to the BE, the page tree is not loaded and I get a JavaScript error (see attached screenshot):

If I reload the BE everything is fine and all areas incl. the page tree come up. I can log-out and log-in again without problems. However, the same issue re-occurs a little later (sometimes during the same session, sometimes the next day or so). I also experience this issue in the Filelist.

I suspect that this is some kind of a timing issue. Although this is not a major problem, this is causing some frustration and confusion.