[17:05:52 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) ~[creative.jar:git-Spigot-1515]
        at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) ~[creative.jar:git-Spigot-1515]
        at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:726) ~[creative.jar:git-Spigot-1515]
        at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:999) [creative.jar:git-Spigot-1515]
        at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:830) [creative.jar:git-Spigot-1515]
        at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28) [creative.jar:git-Spigot-1515]
        at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:65) [creative.jar:git-Spigot-1515]
        at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:180) [creative.jar:git-Spigot-1515]
        at net.minecraft.server.v1_7_R3.ServerConnection.c(ServerConnection.java:81) [creative.jar:git-Spigot-1515]
        at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:720) [creative.jar:git-Spigot-1515]
        at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:283) [creative.jar:git-Spigot-1515]
        at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:583) [creative.jar:git-Spigot-1515]
        at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:489) [creative.jar:git-Spigot-1515]
        at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [creative.jar:git-Spigot-1515]
Caused by: java.lang.NullPointerException
        at com.lishid.openinv.commands.OpenInvPluginCommand.onCommand(OpenInvPluginCommand.java:84) ~[?:?]
        at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[creative.jar:git-Spigot-1515]
        ... 13 more