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[14:16:16 ERROR]: Could not pass event InventoryClickEvent to System v2.2.4
org.bukkit.event.EventException: null
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[pSpigot.jar:?]
        at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[pSpigot.jar:?]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[pSpigot.jar:?]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:517) [pSpigot.jar:?]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:502) [pSpigot.jar:?]
        at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1722) [pSpigot.jar:?]
        at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31) [pSpigot.jar:?]
        at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9) [pSpigot.jar:?]
        at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [pSpigot.jar:?]
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_292]
        at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_292]
        at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [pSpigot.jar:?]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:778) [pSpigot.jar:?]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:364) [pSpigot.jar:?]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:717) [pSpigot.jar:?]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:619) [pSpigot.jar:?]
        at java.lang.Thread.run(Thread.java:748) [?:1.8.0_292]
Caused by: java.lang.NullPointerException
        at de.iraphi.rax.itemfilter.ItemFilterListener.onInventoryClick(ItemFilterListener.java:92) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor420.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_292]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_292]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[pSpigot.jar:?]
        ... 16 more