Bug Report: Game freezes when trying to open, save, or load files in chart editor

[minetube737]

Issue Checklist

• I have properly named my issue
• I have checked the Issues/Discussions pages to see if my issue has already been reported

Platform

Itch.io (Downloadable Build) - Windows

Browser

None

Version

0.5.1

Description (include any images, videos, errors, or crash logs)

The chart editor freezes and crashes when I try to save or load files into it. There is no crash log.

Steps to Reproduce

Save or load files in the chart editor in 0.5.1

[Hundrec]

I'm able to load and save .fnfc files without any problem.
Can you provide a video of the crash happening?

[Lasercar]

This issue needs the status: can't reproduce label / needs clarification

I didn't try to reproduce this myself though, but given the above comment, I don't that's necessary.