It happens on the map or in towns, any time i click items at any location.
Viewing post in Yorna: Monster Girl's Secret comments
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.