Mod Version:
DynamicSurroundings-1.7.10-1.0.6.4.jar
Forge Version:
forge-1.7.10-10.13.4.1614-1.7.10.jar

Link to crash log (if applicable):
https://gist.github.com/Kllen-rain/531ab69cbefc33b3785191c53372719e
Description:
When I shooted by a aether's Cockatrice, my server crashed. Maybe it should give me a debuff. It throw the NullPointerException. I don't know why?

I tested this myself, and it happens for all Aether Legacy 1.7.10 versions.
crash-2020-03-20_18.35.55-server.txt
crash-2020-03-20_18.38.28-server.txt
crash-2020-03-20_18.41.17-server.txt