[14:40:07 ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'openinv' in plugin OpenInv v2.1.9
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Spigot-1564]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:181) ~[spigot.jar:git-Spigot-1564]
        at org.bukkit.craftbukkit.v1_7_R4.CraftServer.dispatchCommand(CraftServer.java:767) ~[spigot.jar:git-Spigot-1564]
        at net.minecraft.server.v1_7_R4.PlayerConnection.handleCommand(PlayerConnection.java:1016) [spigot.jar:git-Spigot-1564]
        at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:846) [spigot.jar:git-Spigot-1564]
        at net.minecraft.server.v1_7_R4.PacketPlayInChat.a(PacketPlayInChat.java:28) [spigot.jar:git-Spigot-1564]
        at net.minecraft.server.v1_7_R4.PacketPlayInChat.handle(PacketPlayInChat.java:65) [spigot.jar:git-Spigot-1564]
        at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:184) [spigot.jar:git-Spigot-1564]
        at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [spigot.jar:git-Spigot-1564]
        at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:731) [spigot.jar:git-Spigot-1564]
        at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [spigot.jar:git-Spigot-1564]
        at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [spigot.jar:git-Spigot-1564]
        at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [spigot.jar:git-Spigot-1564]
        at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Spigot-1564]
Caused by: java.lang.NullPointerException
        at com.lishid.openinv.commands.OpenInvPluginCommand.onCommand(OpenInvPluginCommand.java:84) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Spigot-1564]
        ... 13 more