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org.bukkit.event.EventException at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306)[spigot.jar:git-Spigot-de459a2-51263e9] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)[spigot.jar:git-Spigot-de459a2-51263e9] at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502)[spigot.jar:git-Spigot-de459a2-51263e9] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487)[spigot.jar:git-Spigot-de459a2-51263e9] at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1861)[spigot.jar:git-Spigot-de459a2-51263e9] at net.minecraft.server.v1_10_R1.PacketPlayInWindowClick.a(SourceFile:33)[spigot.jar:git-Spigot-de459a2-51263e9] at net.minecraft.server.v1_10_R1.PacketPlayInWindowClick.a(SourceFile:10)[spigot.jar:git-Spigot-de459a2-51263e9] at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13)[spigot.jar:git-Spigot-de459a2-51263e9] at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)[?:1.8.0_102] at java.util.concurrent.FutureTask.run(Unknown Source)[?:1.8.0_102] at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45)[spigot.jar:git-Spigot-de459a2-51263e9] at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:732)[spigot.jar:git-Spigot-de459a2-51263e9] at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:400)[spigot.jar:git-Spigot-de459a2-51263e9] at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:668)[spigot.jar:git-Spigot-de459a2-51263e9] at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:567)[spigot.jar:git-Spigot-de459a2-51263e9] at java.lang.Thread.run(Unknown Source)[?:1.8.0_102]Caused by: java.lang.NullPointerException at com.gmail.thelimeglass.Command.onInventoryClick(Command.java:54)[?:?] at sun.reflect.GeneratedMethodAccessor255.invoke(Unknown Source)[?:?] at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)[?:1.8.0_102] at java.lang.reflect.Method.invoke(Unknown Source)[?:1.8.0_102] at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302)[spigot.jar:git-Spigot-de459a2-51263e9] ... 15 more