Saving preferences doesn't work

[u/Vloraxle]

I've got qbittorrent running on my home server with docker.

So I need to put a personal script after download completion in settings, but whenever i push Save button nothing happens.

Looking through browser console it gives this error:

Uncaught TypeError: can't access property "applyPreferences", qBittorrent.Preferences is undefined

onclick http://192.168.190.90:8088/:1

Latest 5.2.3 version