Error

17.12 04:07:54 [Server] INFO ... 15 more
17.12 04:07:54 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:339)
17.12 04:07:54 [Server] INFO at java.lang.reflect.Method.invoke(Unknown Source)
17.12 04:07:54 [Server] INFO at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
17.12 04:07:54 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
17.12 04:07:54 [Server] INFO at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
17.12 04:07:54 [Server] INFO at info.plugmania.ijmh.listeners.InventoryListener.onInventoryClose(InventoryListener.java:21)
17.12 04:07:54 [Server] INFO at info.plugmania.ijmh.effects.HeavyDuty.main(HeavyDuty.java:73)
17.12 04:07:54 [Server] INFO at info.plugmania.ijmh.effects.HeavyDuty.extend(HeavyDuty.java:105)
17.12 04:07:54 [Server] INFO at info.plugmania.ijmh.Util.getPlayerArmorValue(Util.java:455)
17.12 04:07:54 [Server] INFO Caused by: java.lang.NullPointerException
17.12 04:07:54 [Server] INFO at net.minecraft.server.ThreadServerApplication.run(SourceFile:856)
17.12 04:07:54 [Server] INFO at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:426)
17.12 04:07:54 [Server] INFO at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:493)
17.12 04:07:54 [Server] INFO at net.minecraft.server.DedicatedServer.r(DedicatedServer.java:222)
17.12 04:07:54 [Server] INFO at net.minecraft.server.MinecraftServer.r(MinecraftServer.java:595)
17.12 04:07:54 [Server] INFO at net.minecraft.server.DedicatedServerConnection.b(SourceFile:30)
17.12 04:07:54 [Server] INFO at net.minecraft.server.ServerConnection.b(SourceFile:39)
17.12 04:07:54 [Server] INFO at net.minecraft.server.NetServerHandler.d(NetServerHandler.java:113)
17.12 04:07:54 [Server] INFO at net.minecraft.server.NetworkManager.b(NetworkManager.java:290)
17.12 04:07:54 [Server] INFO at net.minecraft.server.Packet101CloseWindow.handle(SourceFile:17)
17.12 04:07:54 [Server] INFO at net.minecraft.server.NetServerHandler.handleContainerClose(NetServerHandler.java:1190)
17.12 04:07:54 [Server] INFO at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:462)
17.12 04:07:54 [Server] INFO at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:477)
17.12 04:07:54 [Server] INFO at org.bukkit.plugin.TimedRegisteredListener.callEvent(TimedRegisteredListener.java:35)
17.12 04:07:54 [Server] INFO at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
17.12 04:07:54 [Server] INFO at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:341)
17.12 04:07:54 [Server] INFO org.bukkit.event.EventException
17.12 04:07:54 [Server] SEVERE Could not pass event InventoryCloseEvent to ijmh v2.0.2