You should be able to upload a screenshot of the crash image here.
Thanks for that, that’s our own crash system which provides some information useful for debugging. From what I’ve seen discussed in GBA developer discussions is that MyBoy is known to be inaccurate and has issues with various homebrew games, rather unfortunately there is no list of the inaccuracies that we could use to fix compatability (should we even want to). The web emulator works pretty well on mobile and uses an accurate modern emulator.