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Encountered an Unexpected Error server crash when fighting Ice & Fire dragon (1.16.5)

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Recently me and my friends begun playing on a modded 1.16.5 server, though we've run into a really annoying issue. Almost every time we encounter a dragon (Ice & Fire), the server crashes. It's gotten so bad that whenever we fight a dragon the game crashes at least 3 times before we manage to kill it, if we're lucky. Even our baby dragons have crashed the game once, just from someone standing next to it for a while. Included I have the list of mods currently loaded in the server, as well as the typical crash report. Can anyone help me figure out what's going on here, and possibly how to fix it?

Mod List:



Biomes O' Plenty



Dynamic Trees

Dynamic Trees BOP

Ice & Fire



Netherite Plus

Repurposed Structures

Spartan Shields

Spartan Weaponry


XP Tome

Yung's API

Yung's Better Caves

Yung's Better Dungeons

Yung's Better Mineshafts

Yung's Better Strongholds


Crash Log:


[19Aug2021 00:46:38.377] [Server thread/FATAL] [net.minecraftforge.common.ForgeMod/]: Preparing crash report with UUID 654f2bfe-ac01-4f02-b3ac-e22745d8f321
[19Aug2021 00:46:38.379] [Server thread/ERROR] [net.minecraft.server.MinecraftServer/]: Encountered an unexpected exception
net.minecraft.crash.ReportedException: Ticking entity
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:855) ~[?:?]
    at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:291) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:787) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_240802_v_(MinecraftServer.java:642) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_240783_a_(MinecraftServer.java:232) ~[?:?]
    at java.lang.Thread.run(Thread.java:834) [?:?]
Caused by: java.lang.NullPointerException
    at com.github.alexthe666.citadel.server.entity.datatracker.EntityProperties.getEntity(EntityProperties.java:63) ~[citadel:1.7.3-1.16.5]
    at com.github.alexthe666.iceandfire.entity.props.FrozenEntityProperties.setFrozenFor(FrozenEntityProperties.java:48) ~[iceandfire:2.1.8-1.16.5]
    at com.github.alexthe666.iceandfire.entity.IafDragonDestructionManager.lambda$destroyAreaIce$5(IafDragonDestructionManager.java:172) ~[iceandfire:2.1.8-1.16.5]
    at java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1655) ~[?:?]
    at java.util.stream.ReferencePipeline$Head.forEach(ReferencePipeline.java:658) ~[?:?]
    at com.github.alexthe666.iceandfire.entity.IafDragonDestructionManager.destroyAreaIce(IafDragonDestructionManager.java:167) ~[iceandfire:2.1.8-1.16.5]
    at com.github.alexthe666.iceandfire.entity.EntityIceDragon.stimulateFire(EntityIceDragon.java:481) ~[iceandfire:2.1.8-1.16.5]
    at com.github.alexthe666.iceandfire.entity.EntityDragonBase.tryScorchTarget(EntityDragonBase.java:2175) ~[iceandfire:2.1.8-1.16.5]
    at com.github.alexthe666.iceandfire.entity.IafDragonFlightManager.update(IafDragonFlightManager.java:78) ~[iceandfire:2.1.8-1.16.5]
    at com.github.alexthe666.iceandfire.entity.EntityDragonBase.func_70071_h_(EntityDragonBase.java:1619) ~[iceandfire:2.1.8-1.16.5]
    at net.minecraft.world.server.ServerWorld.func_217479_a(ServerWorld.java:611) ~[?:?]
    at net.minecraft.world.World.func_217390_a(World.java:554) ~[?:?]
    at net.minecraft.world.server.ServerWorld.func_72835_b(ServerWorld.java:404) ~[?:?]
    at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:851) ~[?:?]
    ... 5 more


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