[CBers]

So, it's working stable with SPMC but not with the current beta of Kodi Krypton ?

Looking at your log I'm pretty confident that it is indeed the building of wall backgrounds that's causing the crash.
Please do this:

1) Start the skin
2) Skin settings --> supported addons --> Skin Helper backgrounds
3) Wall backgrounds --> Set interval to 0 to completely disable
4) Close Kodi and restart

Let me know if that fixes the issue

OK, so changing that setting to OFF, seems to stop the crashing.

However, now that Kodi stays running, there's a few other issues.

First example, I wanted to change the submenu of a menu item, but although I can delete and change, I can't ADD an item.

I'll play a bit more and see what else is away.

I'll upload a Kodi log when I get any crashes.

Thanks Marcelveldt.