I take it it's just a me issue then?
Viewing post in Yorna: Monster Girl's Secret comments
I can't reproduce this error on my devices. Asked friends for help and waiting for their feedback.
This is weird though. Usually, errors like these affect all players. Just to be sure, you just get into the on-map menu, tap on the items button in the top section and get this error? Or did I miss something?
Well, even if the error persists, you don't really need items menu. You can equip new stuff via the equip menu and craft materials are all listed in the lower section of the on-map menu.
Can't reproduce this problem on any of my devices or my friends'. Tried emulating your device in a virtual machine and there I get a different error right at the time I try to access the on-map menu. Just to be clear, the on-map menu is the thing you see if you'll hit escape on any in-game map.
In theory, the latest Android versions may cause this because Yorna got its final releases ~8 years ago or something like that. Looks like compatibility leeway is no longer an option for the new devices. I guess there's a distant possibility that I will re-update Yorna to test this out in the future, but I can't name any dates. Plus, I'm not even sure I still have public version project in its final stage for this...
As for the issue, you can sidestep it by not using items menu if others don't cause this error to appear. It will affect mostly out of combat potion and food usage. Or just use the desktop version. Aside from this, can't name any other solutions since it's not RPG Maker code problem, and most likely related to the Altimit packaged I used for Android releases.