Bukkit

When anyone dies is giving this error in the console:

00:43:37 [SEVERE] Could not pass event PlayerQuitEvent to PvPReward v1.9.0
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:427)
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 net.minecraft.server.v1_4_6.PlayerList.disconnect(PlayerList.java:206)
at net.minecraft.server.v1_4_6.PlayerConnection.disconnect(PlayerConnection.java:169)
at org.bukkit.craftbukkit.v1_4_6.entity.CraftPlayer.kickPlayer(CraftPlayer.java:217)
at pl.kyku.AdvancedBans.onCommand(AdvancedBans.java:414)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:186)
at org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchCommand(CraftServer.java:510)
at org.bukkit.craftbukkit.v1_4_6.CraftServer.dispatchServerCommand(CraftServer.java:502)
at net.minecraft.server.v1_4_6.DedicatedServer.al(DedicatedServer.java:260)
at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:225)
at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:494)
at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:427)
at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NullPointerException
at com.iCo6.system.Queried.hasAccount(Queried.java:311)
at com.iCo6.system.Accounts.get(Accounts.java:14)
at net.milkbowl.vault.economy.plugins.Economy_iConomy6.depositPlayer(Economy_iConomy6.java:156)
at com.codisimus.plugins.pvpreward.Econ.giveMoney(Econ.java:77)
at com.codisimus.plugins.pvpreward.PvPRewardListener.onPlayerQuit(PvPRewardListener.java:188)
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)