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java.lang.NullPointerException: 	at org.bukkit.craftbukkit.v1_10_R1.entity.CraftHumanEntity.openInventory(CraftHumanEntity.java:183)	at com.wasteofplastic.askyblock.commands.IslandCmd.onCommand(IslandCmd.java:1386)	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141)	at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:647)	at org.bukkit.craftbukkit.v1_10_R1.entity.CraftPlayer.performCommand(CraftPlayer.java:243)	at com.wasteofplastic.askyblock.commands.IslandCmd.onCommand(IslandCmd.java:1076)	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141)	at org.bukkit.craftbukkit.v1_10_R1.CraftServer.dispatchCommand(CraftServer.java:647)	at net.minecraft.server.v1_10_R1.PlayerConnection.handleCommand(PlayerConnection.java:1358)	at net.minecraft.server.v1_10_R1.PlayerConnection.a(PlayerConnection.java:1193)	at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:45)	at net.minecraft.server.v1_10_R1.PacketPlayInChat.a(PacketPlayInChat.java:1)	at net.minecraft.server.v1_10_R1.PlayerConnectionUtils$1.run(SourceFile:13)	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)	at java.util.concurrent.FutureTask.run(FutureTask.java:266)	at net.minecraft.server.v1_10_R1.SystemUtils.a(SourceFile:45)	at net.minecraft.server.v1_10_R1.MinecraftServer.D(MinecraftServer.java:732)	at net.minecraft.server.v1_10_R1.DedicatedServer.D(DedicatedServer.java:400)	at net.minecraft.server.v1_10_R1.MinecraftServer.C(MinecraftServer.java:668)	at net.minecraft.server.v1_10_R1.MinecraftServer.run(MinecraftServer.java:567)	at java.lang.Thread.run(Thread.java:748)