> [06:02:55 ERROR]: Could not pass event InventoryClickEvent to Overflow v2.9
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) ~[server.jar:git-TacoSpigot-fd3209f3]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[server.jar:git-TacoSpigot-fd3209f3]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[server.jar:git-TacoSpigot-fd3209f3]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:505) [server.jar:git-TacoSpigot-fd3209f3]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:480) [server.jar:git-TacoSpigot-fd3209f3]
at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1737) [server.jar:git-TacoSpigot-fd3209f3]
at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31) [server.jar:git-TacoSpigot-fd3209f3]
at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9) [server.jar:git-TacoSpigot-fd3209f3]
at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [server.jar:git-TacoSpigot-fd3209f3]
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_212]
at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_212]
at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [server.jar:git-TacoSpigot-fd3209f3]
at net.minecraft.server.v1_8_R3.MinecraftServer.tickScheduler(MinecraftServer.java:812) [server.jar:git-TacoSpigot-fd3209f3]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:820) [server.jar:git-TacoSpigot-fd3209f3]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:384) [server.jar:git-TacoSpigot-fd3209f3]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:752) [server.jar:git-TacoSpigot-fd3209f3]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:649) [server.jar:git-TacoSpigot-fd3209f3]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
Caused by: java.lang.NullPointerException
at us.overflow.gui.listener.GUIListener.onClick(Unknown Source) ~[?:?]
at sun.reflect.GeneratedMethodAccessor371.invoke(Unknown Source) ~[?:?]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_212]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_212]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:300) ~[server.jar:git-TacoSpigot-fd3209f3]
... 17 more