Zigbee2mqtt web-ui stopped working / blank page

Hi all,

my zigbee2mqtt web-ui stopped working and is only showing a blank page since a couple of days.
I cannot pinpoint it to an exact date or update since I am not using it very often.

The add-on in general is still running and all the devices and automations also still work. But the web-ui is not rendering properly and will only give me a blank page.

I had this happen once before, but I was able to rectify this by deleting my browsers cache and cookies.
This time I was not so lucky. Tried it with several browsers on different computers, incognito tabs, etc. no success.
Funny enough: It still works on my android phone´s mobile-app but not on my android tablet.

I cannot find anything in the logs either.
The only thing I was able to find was an error in the web-console while rendering the page that kinda points to an ingress prob:

Does anyone have a similar experience? How to debug this?
I really wanna try this first, before re-doing all the zigbee2mqtt setup again…

I experience the exact seem error. I have created an issue on Github.