Time: 7/28/18 5:11 PM
Description: Ticking entity

java.lang.NullPointerException: Ticking entity
at net.shadowmage.ancientwarfare.npc.registry.NpcDefaultsRegistry.getFactionNpcDefault(NpcDefaultsRegistry.java:36)
at net.shadowmage.ancientwarfare.npc.entity.NpcLevelingStats.onBaseLevelGained(NpcLevelingStats.java:77)
at net.shadowmage.ancientwarfare.npc.entity.NpcLevelingStats.addExperience(NpcLevelingStats.java:66)
at net.shadowmage.ancientwarfare.npc.entity.NpcBase.addExperience(NpcBase.java:669)
at net.shadowmage.ancientwarfare.npc.entity.NpcBase.func_70074_a(NpcBase.java:616)
at net.minecraft.entity.EntityLivingBase.func_70645_a(EntityLivingBase.java:1172)
at net.minecraft.entity.EntityLivingBase.func_70097_a(EntityLivingBase.java:1014)
at net.minecraft.entity.monster.EntityMob.func_70097_a(EntityMob.java:70)
at net.shadowmage.ancientwarfare.npc.entity.NpcBase.func_70652_k(NpcBase.java:240)
at net.shadowmage.ancientwarfare.npc.ai.NpcAIAttackMeleeLongRange.doAttack(NpcAIAttackMeleeLongRange.java:27)
at net.shadowmage.ancientwarfare.npc.ai.NpcAIAttack.func_75246_d(NpcAIAttack.java:51)
at net.minecraft.entity.ai.EntityAITasks.func_75774_a(SourceFile:129)
at net.minecraft.entity.EntityLiving.func_70626_be(EntityLiving.java:888)
at net.minecraft.entity.EntityLivingBase.func_70636_d(EntityLivingBase.java:2350)
at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:678)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2170)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:377)
at net.shadowmage.ancientwarfare.npc.entity.NpcBase.func_70071_h_(NpcBase.java:820)
at net.minecraft.world.World.func_72866_a(World.java:1990)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:832)
at net.minecraft.world.World.func_72870_g(World.java:1952)
at net.minecraft.world.World.func_72939_s(World.java:1756)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:613)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:767)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:668)
at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:252)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Thread.java:745)

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

-- Head --
Thread: Server thread
Stacktrace:
at net.shadowmage.ancientwarfare.npc.registry.NpcDefaultsRegistry.getFactionNpcDefault(NpcDefaultsRegistry.java:36)
at net.shadowmage.ancientwarfare.npc.entity.NpcLevelingStats.onBaseLevelGained(NpcLevelingStats.java:77)
at net.shadowmage.ancientwarfare.npc.entity.NpcLevelingStats.addExperience(NpcLevelingStats.java:66)
at net.shadowmage.ancientwarfare.npc.entity.NpcBase.addExperience(NpcBase.java:669)
at net.shadowmage.ancientwarfare.npc.entity.NpcBase.func_70074_a(NpcBase.java:616)
at net.minecraft.entity.EntityLivingBase.func_70645_a(EntityLivingBase.java:1172)
at net.minecraft.entity.EntityLivingBase.func_70097_a(EntityLivingBase.java:1014)
at net.minecraft.entity.monster.EntityMob.func_70097_a(EntityMob.java:70)
at net.shadowmage.ancientwarfare.npc.entity.NpcBase.func_70652_k(NpcBase.java:240)
at net.shadowmage.ancientwarfare.npc.ai.NpcAIAttackMeleeLongRange.doAttack(NpcAIAttackMeleeLongRange.java:27)
at net.shadowmage.ancientwarfare.npc.ai.NpcAIAttack.func_75246_d(NpcAIAttack.java:51)
at net.minecraft.entity.ai.EntityAITasks.func_75774_a(SourceFile:129)
at net.minecraft.entity.EntityLiving.func_70626_be(EntityLiving.java:888)
at net.minecraft.entity.EntityLivingBase.func_70636_d(EntityLivingBase.java:2350)
at net.minecraft.entity.EntityLiving.func_70636_d(EntityLiving.java:678)
at net.minecraft.entity.EntityLivingBase.func_70071_h_(EntityLivingBase.java:2170)
at net.minecraft.entity.EntityLiving.func_70071_h_(EntityLiving.java:377)
at net.shadowmage.ancientwarfare.npc.entity.NpcBase.func_70071_h_(NpcBase.java:820)
at net.minecraft.world.World.func_72866_a(World.java:1990)
at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:832)
at net.minecraft.world.World.func_72870_g(World.java:1952)

-- Entity being ticked --
Details:
Entity Type: ancientwarfarenpc:faction.soldier (net.shadowmage.ancientwarfare.npc.entity.faction.NpcFactionSoldier)
Entity ID: 8708
Entity Name: Pirate Soldier
Entity's Exact location: 2.39, 71.00, 383.57
Entity's Block location: World: (2,71,383), Chunk: (at 2,4,15 in 0,23; contains blocks 0,0,368 to 15,255,383), Region: (0,0; contains chunks 0,0 to 31,31, blocks 0,0,0 to 511,255,511)
Entity's Momentum: -0.01, -0.08, 0.00
Entity's Passengers: []
Entity's Vehicle: ERROR NullPointerException: null
Stacktrace:
at net.minecraft.world.World.func_72939_s(World.java:1756)
at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:613)

Did this happen in a new world?
Existing world where AW was updated from previous version?
Have you got custom structure templates that have faction npcs saved?
Or perhaps even changed factions?

Brand new world, the only custom things I have added are I am using some BDcraft skins, but I have always used those with your mod.

I tried recreating this, but I am unable to despite many npcs I have leveled up, so I am going to close. Feel free to open new issue if this happens again.