What were you doing when it crashed? Playing the game, loading the game, looking at settings?
What game were you attempting to play, if not already playing, when the emulator crashed?
Was it an official game or a rom hack?
What was it's checksum? This is to confirm if the game or rom hack weren't from a bad dump. Trust me, a bad dump can cause unwanted things to happen even on real hardware. You can find this by clicking on File and then selecting "ROM info.."
Were you doing anything else on your PC, like downloading games, watching videos, recording or streaming?
The game is emerald jap, and the checksum is verified to be correct.
I was playing it, sometimes with another game in full screen (when it crashed during gameplay), causing the game that was fullscreened to reduce into icon while playing because Windows 10 is trash and prompting the crash error, the other in multiplayer instance with another game (when it crashed closing either game from the X).
It also crashed in single instance when closing with the X.
I have had like 10 crashes, but never crashed on mgba 0.8.1.