java.lang.NullPointerException: Cannot invoke "net.minecraft.class_1297.method_5643(net.minecraft.class_1282, float)" because "entity" is null
at io.github.apace100.apoli.power.factory.action.EntityActions.lambda$register$1(EntityActions.java:70)
at io.github.apace100.apoli.power.factory.action.ActionFactory$Instance.accept(ActionFactory.java:41)
at io.github.apace100.apoli.power.factory.action.BiEntityActions.lambda$register$2(BiEntityActions.java:47)
at io.github.apace100.apoli.power.factory.action.ActionFactory$Instance.accept(ActionFactory.java:41)
at io.github.apace100.apoli.power.factory.action.meta.AndAction.lambda$action$0(AndAction.java:14)
at java.base/java.lang.Iterable.forEach(Iterable.java:75)
at io.github.apace100.apoli.power.factory.action.meta.AndAction.action(AndAction.java:14)
at io.github.apace100.apoli.power.factory.action.ActionFactory$Instance.accept(ActionFactory.java:41)
at io.github.apace100.apoli.power.factory.action.meta.ChanceAction.action(ChanceAction.java:16)
at io.github.apace100.apoli.power.factory.action.ActionFactory$Instance.accept(ActionFactory.java:41)
at io.github.apace100.apoli.power.ModifyDamageTakenPower.executeActions(ModifyDamageTakenPower.java:87)
at net.minecraft.class_1309.md053716$lambda$modifyDamageTaken$10$19(class_1309.java:8775)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
at java.base/java.util.LinkedList$LLSpliterator.forEachRemaining(LinkedList.java:1242)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
at io.github.apace100.apoli.component.PowerHolderComponent.modify(PowerHolderComponent.java:156)
at io.github.apace100.apoli.component.PowerHolderComponent.modify(PowerHolderComponent.java:141)
at net.minecraft.class_1309.localvar$zlk000$modifyDamageTaken(class_1309.java:8774)
at net.minecraft.class_1309.method_5643(class_1309.java)
at net.minecraft.class_1657.method_5643(class_1657.java:952)
at net.minecraft.class_3222.method_5643(class_3222.java:713)
at org.betterx.betternether.entity.EntitySkull.method_5694(EntitySkull.java:109)
at net.minecraft.class_1657.method_7341(class_1657.java:631)
at net.minecraft.class_1657.method_6007(class_1657.java:604)
at net.minecraft.class_1309.method_5773(class_1309.java:2385)
at net.minecraft.class_1657.method_5773(class_1657.java:284)
at net.minecraft.class_3222.method_14226(class_3222.java:487)
at net.minecraft.class_3244.method_18784(class_3244.java:268)
at net.minecraft.class_2535.method_10754(class_2535.java:248)
at net.minecraft.class_3242.method_14357(class_3242.java:183)
at net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:886)
at net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:819)
at net.minecraft.class_1132.method_3748(class_1132.java:98)
at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:665)
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:257)
at java.base/java.lang.Thread.run(Thread.java:833)

A detailed walkthrough of the error, its code path and all known details is as follows:

-- Head --
Thread: Server thread
Stacktrace:
at io.github.apace100.apoli.power.factory.action.EntityActions.lambda$register$1(EntityActions.java:70)
at io.github.apace100.apoli.power.factory.action.ActionFactory$Instance.accept(ActionFactory.java:41)
at io.github.apace100.apoli.power.factory.action.BiEntityActions.lambda$register$2(BiEntityActions.java:47)
at io.github.apace100.apoli.power.factory.action.ActionFactory$Instance.accept(ActionFactory.java:41)
at io.github.apace100.apoli.power.factory.action.meta.AndAction.lambda$action$0(AndAction.java:14)
at java.base/java.lang.Iterable.forEach(Iterable.java:75)
at io.github.apace100.apoli.power.factory.action.meta.AndAction.action(AndAction.java:14)
at io.github.apace100.apoli.power.factory.action.ActionFactory$Instance.accept(ActionFactory.java:41)
at io.github.apace100.apoli.power.factory.action.meta.ChanceAction.action(ChanceAction.java:16)
at io.github.apace100.apoli.power.factory.action.ActionFactory$Instance.accept(ActionFactory.java:41)
at io.github.apace100.apoli.power.ModifyDamageTakenPower.executeActions(ModifyDamageTakenPower.java:87)
at net.minecraft.class_1309.md053716$lambda$modifyDamageTaken$10$19(class_1309.java:8775)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183)
at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
at java.base/java.util.LinkedList$LLSpliterator.forEachRemaining(LinkedList.java:1242)
at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150)
at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173)
at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
at io.github.apace100.apoli.component.PowerHolderComponent.modify(PowerHolderComponent.java:156)
at io.github.apace100.apoli.component.PowerHolderComponent.modify(PowerHolderComponent.java:141)
at net.minecraft.class_1309.localvar$zlk000$modifyDamageTaken(class_1309.java:8774)
at net.minecraft.class_1309.method_5643(class_1309.java)
at net.minecraft.class_1657.method_5643(class_1657.java:952)
at net.minecraft.class_3222.method_5643(class_3222.java:713)
at org.betterx.betternether.entity.EntitySkull.method_5694(EntitySkull.java:109)
at net.minecraft.class_1657.method_7341(class_1657.java:631)
at net.minecraft.class_1657.method_6007(class_1657.java:604)
at net.minecraft.class_1309.method_5773(class_1309.java:2385)
at net.minecraft.class_1657.method_5773(class_1657.java:284)

-- Player being ticked --
Details:
Entity Type: minecraft:player (net.minecraft.class_3222)
Entity ID: 244
Entity Name: Xellik
Entity's Exact location: 2.92, 62.00, 5.50
Entity's Block location: World: (2,62,5), Section: (at 2,14,5 in 0,3,0; chunk contains blocks 0,0,0 to 15,255,15), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Entity's Momentum: 0.00, -0.08, 0.00
Entity's Passengers: []
Entity's Vehicle: null
Stacktrace:
at net.minecraft.class_3222.method_14226(class_3222.java:487)
at net.minecraft.class_3244.method_18784(class_3244.java:268)
at net.minecraft.class_2535.method_10754(class_2535.java:248)
at net.minecraft.class_3242.method_14357(class_3242.java:183)
at net.minecraft.server.MinecraftServer.method_3813(MinecraftServer.java:886)
at net.minecraft.server.MinecraftServer.method_3748(MinecraftServer.java:819)
at net.minecraft.class_1132.method_3748(class_1132.java:98)
at net.minecraft.server.MinecraftServer.method_29741(MinecraftServer.java:665)
at net.minecraft.server.MinecraftServer.method_29739(MinecraftServer.java:257)
at java.base/java.lang.Thread.run(Thread.java:833)

Thanks for the report. Does this occur with any mob other than the Skull from Better Nether (as it seems this caused the crash from a brief look at the log).

Yeah, taking frostbite damage causes the same thing.

One of the origins we use causes a player to 'freeze' at night if not wearing a leather chestpiece(Animal Origins), and when he took damage it caused a tick crash as well. Had to delete his player data but luckily it was early enough he didnt lose much

Right, I'll look into what specifically is causing this when I have some free time. If I can't determine what is causing this or am unable to fix it I'll adjust how the Druid works most likely.

I've identified the issue as the power trying to inflict thorns damage to a non-living damage source. This will be fixed in the next patch. If you encounter the problem again after the update, feel free to submit another issue.