error

31.08 03:22:15 [Server] INFO ... 16 more
31.08 03:22:15 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:330)
31.08 03:22:15 [Server] INFO at java.lang.reflect.Method.invoke(Method.java:601)
31.08 03:22:15 [Server] INFO at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
31.08 03:22:15 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
31.08 03:22:15 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
31.08 03:22:15 [Server] INFO at de.beimax.buycommand.listeners.BuyCommandPlayerListener.onPlayerCommandPreprocess(BuyCommandPlayerListener.java:58)
31.08 03:22:15 [Server] INFO at de.beimax.buycommand.BuyCommandProcessor.processCommand(BuyCommandProcessor.java:32)
31.08 03:22:15 [Server] INFO Caused by: java.lang.NullPointerException
31.08 03:22:15 [Server] INFO at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)
31.08 03:22:15 [Server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:406)
31.08 03:22:15 [Server] INFO at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:474)
31.08 03:22:15 [Server] INFO at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
31.08 03:22:15 [Server] INFO at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:581)
31.08 03:22:15 [Server] INFO at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
31.08 03:22:15 [Server] INFO at net.minecraft.server.ServerConnection.b(SourceFile:35)
31.08 03:22:15 [Server] INFO at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:109)
31.08 03:22:15 [Server] INFO at net.minecraft.server.NetworkManager.b(NetworkManager.java:276)
31.08 03:22:15 [Server] INFO at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:44)
31.08 03:22:15 [Server] INFO at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:807)
31.08 03:22:15 [Server] INFO at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:825)
31.08 03:22:15 [Server] INFO at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:871)
31.08 03:22:15 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
31.08 03:22:15 [Server] INFO at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
31.08 03:22:15 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
31.08 03:22:15 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:332)
31.08 03:22:15 [Server] INFO org.bukkit.event.EventException
31.08 03:22:15 [Server] SEVERE Could not pass event PlayerCommandPreprocessEvent to BuyCommand