Using Patterns, item tooltip shows price of 0 about dtlcitizenstrader HOT 10 CLOSED

15:52:53 [SEVERE] Could not pass event NPCRightClickEvent to DtlCitizensTrader v
2.3.0 Beta
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.ja
va:427)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:462)
        at net.citizensnpcs.EventListen.onPlayerInteractEntity(EventListen.java:
226)
        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.ja
va:425)
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.jav
a:62)
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.j
ava:477)
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.j
ava:462)
        at net.minecraft.server.v1_4_6.PlayerConnection.a(PlayerConnection.java:
1096)
        at net.minecraft.server.v1_4_6.Packet7UseEntity.handle(SourceFile:36)
        at net.minecraft.server.v1_4_6.NetworkManager.b(NetworkManager.java:290)

        at net.minecraft.server.v1_4_6.PlayerConnection.d(PlayerConnection.java:
112)
        at net.minecraft.server.v1_4_6.ServerConnection.b(SourceFile:39)
        at net.minecraft.server.v1_4_6.DedicatedServerConnection.b(SourceFile:30
)
        at net.minecraft.server.v1_4_6.MinecraftServer.r(MinecraftServer.java:59
8)
        at net.minecraft.server.v1_4_6.DedicatedServer.r(DedicatedServer.java:22
4)
        at net.minecraft.server.v1_4_6.MinecraftServer.q(MinecraftServer.java:49
4)
        at net.minecraft.server.v1_4_6.MinecraftServer.run(MinecraftServer.java:
427)
        at net.minecraft.server.v1_4_6.ThreadServerApplication.run(SourceFile:84
9)
Caused by: java.lang.NullPointerException
        at net.dtl.citizens.trader.objects.TransactionPattern.getItemPrice(Trans
actionPattern.java:225)
        at net.dtl.citizens.trader.types.Trader.getPrice(Trader.java:564)
        at net.dtl.citizens.trader.types.Trader.loadDescriptions(Trader.java:586
)
        at net.dtl.citizens.trader.types.ServerTrader.onRightClick(ServerTrader.
java:978)
        at net.dtl.citizens.trader.NpcEcoManager.onNPCRightCLick(NpcEcoManager.j
ava:342)
        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.ja
va:425)
        ... 23 more
>