Versions

• Minecraft: 1.12.2
• Forge: 14.23.5.2816
• Vampirism: 1.5.1

Issue Description

When throwing a Splash Potion of Special Holy Water at a Vampire Baron (any level) will cause the game to crash saying: "The game crashed whilst ticking entity". I did this twice in 2 different worlds and the game crashed both times.
The effected world will not be playable after doing this; attempting to rejoin a Minecraft World (singleplayer) where the Hunter Player thrown Holy Water at a Baron will immediately kick and crash the player.

The Vampire Barons does not need to die from Holy Water, simply hitting them Directly will cause a crash

Reproduce Steps

Start a Minecraft World (flat will do)
Make it night time and spawn a Vampire Baron (any level)
Throw a Splash Potion of Special Holy Water directly at the Baron
Make sure the Baron is hit by the Holy Water potion directly (not on the ground near the baron, that only may cause a crash)

Additional Information

The crash report:
crash-2019-07-15_15.14.53-server.txt
latest.log
debug.log