PC98 Core - np2kai can't save state in android

First and foremost consider this:

• Only RetroArch bugs should be filed here. Not core bugs or game bugs
• This is not a forum or a help section, this is strictly developer oriented

Description

[Description of the bug]
Save state does not work on np2kai core in current RetroArch android app.
I have tested with the latest np2kai (0.86 rev 91) and works well.
So please update below source.
https://github.com/libretro/NP2kai

Expected behavior

[What you expected to happen]
Save state works well

Actual behavior

[What is actually happening]
Android Application crashed

Steps to reproduce the bug

1. Run PC98 game with np2kai core
2. Save state

Bisect Results

[Try to bisect and tell us when this started happening]

Version/Commit

You can find this information under Information/System Information

• RetroArch: 1.16.0 (The latest version on Galaxy Store at current date)

Environment information

• OS: Android
• Compiler: N/A

Start by reproducing the crash in an Android RetroArch build using the np2kai core, following the two steps in the report. Read the linked NP2kai repository and compare its save-state behavior with the version used by RetroArch 1.16.0; done means saving a state no longer crashes the Android application.