Since this is a compatibility issue I'm going to leave it up to you and the developer of better end (which I am also opening an issue with) to discuss the problem and whether or not it is worthwhile to fix.

While in the end, dying, killing the dragon, and going through the portal crash the game sort of reproducibly. Sometimes the save may fix itself and stop crashing but creating a new world seemed to bring the crashes back. Some, all or rarely none of the crashes occur for the world, and some, all or none occur for different players on a server.

See attached log for more details.
2020-11-28-7.log

Hi @AtelierAmber,

Sorry for the late response. Are you muting any of the sounds from the dragon/end? I'll be looking into this to see which is one if causing the issue and how to fix.

Like paulevsGitch said, I'm unsure why that call is returning null...

Thanks and if I don't hear from you until then, have a good holiday (if you celebrate)!