Delirium crash on a unique monster animation

When in a deli orb map I am finding there is a certain fire/flame animation that unique mobs make and it has been consistently crashing my game for the past ~12-24 hours (uncertain when it started exactly).

Bug Report ID: #1,378,431,589

Updating actually it appears to be the slam animation from my perfect forest warrior spectre, but it is seemingly only crashing when it's attacking unique monsters in a deli orb map.