Retroarch v1.20.0 crashing at Wii U menu interaction

Is there an existing issue for this?

• This is a bug in RetroArch frontend
• I have searched the existing issues

Description

I updated my WiiU Retroarch install (from v1.19.1) to v1.20.0. Initially OK when loading a core/content (Snes9x), however after I closed the content and began navigating around the UI a crash/exception occurred.

I reloaded and check a different core/content (Fuse) and found the same; a crash after closing and then brief navigation around the UI.

[ Update: I since found the specific UI navigation to be opening the 'load content' option to explore files ]

As I had upgraded I had kept my original configuration/save files etc. To eliminate some inconsistency with those I went back and did a fresh folder install of Retroarch (for my WiiU SD card) and tried again with no prior/save configurations.

The same result, a crash after existing a core and UI navigation.

Expected behavior

Normal UI navigation (without hard exception/crash)

Steps to reproduce the bug

In WiiU Retroarch:

1. Load a core/content.
2. Exit that content.
3. Navigate around in load content
4. Exception occurs.

Version/Commit

1.20.0

Bisect Results

No response

Check in the nightly version

I don't know

Platform & operating system

Wii U

Affected Cores

Snes9X (main) and Fuse at least (suspect all cores but have not tested more as yet)

Environment information

Wii U

Relevant log output

No response

Reproduce the crash on a Wii U installation of RetroArch 1.20.0 using the reported sequence: load core/content, exit it, then open Load Content and navigate files. Compare with 1.19.1 if useful; done means normal navigation without the exception, including with Snes9X and Fuse.