PVPReward/Citizens Error

07:15 PM [SEVERE] Could not pass event PlayerDeathEvent to PvPReward v1.9.0
Caused by: java.lang.NullPointerException
    at net.milkbowl.vault.permission.plugins.Permission_bPermissions2.has(Permission_bPermissions2.java:95)
    at com.codisimus.plugins.pvpreward.PvPReward.hasPermisson(PvPReward.java:227)
    at com.codisimus.plugins.pvpreward.Rewarder.rewardPvP(Rewarder.java:81)
    at com.codisimus.plugins.pvpreward.PvPRewardListener.onEntityDeath(PvPRewardListener.java:107)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
    at java.lang.reflect.Method.invoke(Unknown Source)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
    at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
    at org.bukkit.craftbukkit.v1_5_R2.event.CraftEventFactory.callPlayerDeathEvent(CraftEventFactory.java:339)
    at net.minecraft.server.v1_5_R2.EntityPlayer.die(EntityPlayer.java:282)
    at net.minecraft.server.v1_5_R2.EntityLiving.damageEntity(EntityLiving.java:750)
    at net.minecraft.server.v1_5_R2.EntityHuman.damageEntity(EntityHuman.java:684)
    at net.minecraft.server.v1_5_R2.EntityPlayer.damageEntity(EntityPlayer.java:347)
    at net.minecraft.server.v1_5_R2.EntityHuman.attack(EntityHuman.java:874)
    at net.citizensnpcs.npc.ai.MCTargetStrategy.update(MCTargetStrategy.java:117)
    at net.citizensnpcs.npc.ai.CitizensNavigator.run(CitizensNavigator.java:114)
    at net.citizensnpcs.npc.CitizensNPC.update(CitizensNPC.java:220)
    at net.citizensnpcs.npc.entity.EntityHumanNPC.l_(EntityHumanNPC.java:160)
    at net.minecraft.server.v1_5_R2.World.entityJoinedWorld(World.java:1355)
    at net.minecraft.server.v1_5_R2.WorldServer.entityJoinedWorld(WorldServer.java:614)
    at net.minecraft.server.v1_5_R2.World.playerJoinedWorld(World.java:1336)
    at net.minecraft.server.v1_5_R2.World.tickEntities(World.java:1224)
    at net.minecraft.server.v1_5_R2.WorldServer.tickEntities(WorldServer.java:480)
    at net.minecraft.server.v1_5_R2.MinecraftServer.r(MinecraftServer.java:562)
    at net.minecraft.server.v1_5_R2.DedicatedServer.r(DedicatedServer.java:225)
    at net.minecraft.server.v1_5_R2.MinecraftServer.q(MinecraftServer.java:476)
    at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java:409)
    at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:573)