Server crash from ticking entity ars_nouveau:spell_proj, possible mod incompat?

[purejosh]

Hey! Had a weird crash today, looks like maybe Variable Mob Height is attempting to alter the spell_proj entity, causing a crash? Not too sure, I'm not the greatest at understanding stacktraces yet, haha. Mind taking a look at this crash log?

FML: 47.3
Forge: net.minecraftforge:47.3.7
    vmh-1.2.2-1.20.1.jar
    ars_nouveau-1.20.1-4.12.4-all.jar

https://gist.github.com/purejosh/3d28e7ab9d42309033f566b0655fa8c7

[Alexthw46]

Not sure why the mob type is null, but more than the spell projectile this crash is tied specifically to the animate block glyph