12:31:22 [SEVERE] Could not pass event PreTransactionEvent to ChestShop v3.50 t0045
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 com.Acrobot.ChestShop.Listeners.Player.PlayerInteract.onInteract(PlayerInteract.java:104)
    at sun.reflect.GeneratedMethodAccessor77.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    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_4_R1.event.CraftEventFactory.callPlayerInteractEvent(CraftEventFactory.java:178)
    at net.minecraft.server.v1_4_R1.PlayerInteractManager.interact(PlayerInteractManager.java:376)
    at net.minecraft.server.v1_4_R1.PlayerConnection.a(PlayerConnection.java:657)
    at net.minecraft.server.v1_4_R1.Packet15Place.handle(SourceFile:58)
    at net.minecraft.server.v1_4_R1.NetworkManager.b(NetworkManager.java:290)
    at net.minecraft.server.v1_4_R1.PlayerConnection.d(PlayerConnection.java:113)
    at net.minecraft.server.v1_4_R1.ServerConnection.b(SourceFile:39)
    at net.minecraft.server.v1_4_R1.DedicatedServerConnection.b(SourceFile:30)
    at net.minecraft.server.v1_4_R1.MinecraftServer.r(MinecraftServer.java:598)
    at net.minecraft.server.v1_4_R1.DedicatedServer.r(DedicatedServer.java:224)
    at net.minecraft.server.v1_4_R1.MinecraftServer.q(MinecraftServer.java:494)
    at net.minecraft.server.v1_4_R1.MinecraftServer.run(MinecraftServer.java:427)
    at net.minecraft.server.v1_4_R1.ThreadServerApplication.run(SourceFile:849)
Caused by: java.lang.NullPointerException
    at com.Acrobot.Breeze.Utils.InventoryUtil.hasItems(InventoryUtil.java:70)
    at com.Acrobot.ChestShop.Listeners.PreTransaction.PartialTransactionModule.onPreBuyTransaction(PartialTransactionModule.java:64)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
    ... 24 more