[19:01:31 ERROR]: Could not pass event InventoryClickEvent to XHub v1.0.7-RELEASE
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[spigot.jar:git-PaperSpigot-43]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot.jar:git-PaperSpigot-43]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [spigot.jar:git-PaperSpigot-43]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [spigot.jar:git-PaperSpigot-43]
        at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:1478) [spigot.jar:git-PaperSpigot-43]
        at net.minecraft.server.v1_7_R4.PacketPlayInWindowClick.a(PacketPlayInWindowClick.java:15) [spigot.jar:git-PaperSpigot-43]
        at net.minecraft.server.v1_7_R4.PacketPlayInWindowClick.handle(PacketPlayInWindowClick.java:65) [spigot.jar:git-PaperSpigot-43]
        at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:189) [spigot.jar:git-PaperSpigot-43]
        at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [spigot.jar:git-PaperSpigot-43]
        at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:789) [spigot.jar:git-PaperSpigot-43]
        at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:307) [spigot.jar:git-PaperSpigot-43]
        at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:638) [spigot.jar:git-PaperSpigot-43]
        at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:544) [spigot.jar:git-PaperSpigot-43]
        at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-PaperSpigot-43]
Caused by: java.lang.NullPointerException
        at es.alejandro12120.xhub.listeners.InventoriesHandler.onClick(InventoriesHandler.java:321) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor15.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.8.0_172]
        at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.8.0_172]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) ~[spigot.jar:git-PaperSpigot-43]