Błędy!

Caly czas SkQuery sypie mi takie błedy. WIe ktos czym to jest spowodowane?

[15:57:17] [server thread/ERROR]: Could not pass event InventoryClickEvent to SkQuery v3.21.4 org.bukkit.event.EventException at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:302) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:509) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:494) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] at net.minecraft.server.v1_7_R4.PlayerConnection.a(PlayerConnection.java:1477) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] at net.minecraft.server.v1_7_R4.PacketPlayInWindowClick.a(PacketPlayInWindowClick.java:15) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] at net.minecraft.server.v1_7_R4.PacketPlayInWindowClick.handle(PacketPlayInWindowClick.java:65) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] at net.minecraft.server.v1_7_R4.NetworkManager.a(NetworkManager.java:186) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] at net.minecraft.server.v1_7_R4.ServerConnection.c(ServerConnection.java:81) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] at net.minecraft.server.v1_7_R4.MinecraftServer.v(MinecraftServer.java:734) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] at net.minecraft.server.v1_7_R4.DedicatedServer.v(DedicatedServer.java:289) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] at net.minecraft.server.v1_7_R4.MinecraftServer.u(MinecraftServer.java:584) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] at net.minecraft.server.v1_7_R4.MinecraftServer.run(MinecraftServer.java:490) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] at net.minecraft.server.v1_7_R4.ThreadServerApplication.run(SourceFile:628) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] Caused by: java.lang.NullPointerException at com.w00tmast3r.skquery.util.custom.menus.v1_.VirtualChestManager.onInventoryClick(VirtualChestManager.java:31) [?:?] at sun.reflect.GeneratedMethodAccessor192.invoke(Unknown Source) [?:?] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [?:1.7.0_45] at java.lang.reflect.Method.invoke(Method.java:606) [?:1.7.0_45] at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:298) [prison.jar:git-Spigot-1.7.9-R0.2-205-g2c31986] ... 13 more