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This did the trick, thanks. (I indeed am using nginx as a reverse proxy to access opnsense ui)

Something that also worked for me was to replace tabulator.min.js by the one from tabulator's git repo (v6.4.0), but I still had trouble with fonts and other stuff. Disabling KTLS fixed it altogether.

With KTLS enabled, accessing the UI without reverse proxy doesn't throw any error.


Now I'm facing another issue, accessing Nginx configuration instantly crashes the UI. I'll look into it later.

Hello.
I wanted to open an issue on GH but since you posted this, I'm gonna bump here instead.
Encountering the same problem, on Chromium/Firefox as well as on any other browser I tried.
Also some fonts are not loading.

Didn't investigate as far as you did but browser console throws the same error.