I have been getting this error that seems to crash the unity editor.
The easiest way to recreate the error is to create a new unity 2d project and import fmod 20.1.9
Then add 2 ui buttons with event emitters on them.
It should start spitting out errors after the first or second time trying playback.
Only way to get out is to let it sit, or to delete one of the event emitters
Tested on multiple different versions of unity.
Doesn’t seem to happen if you use 20.1.7