2:58:01 PM [INFO] DeathJusty issued server command: /xpboost gui
2:58:03 PM [SEVERE] Could not pass event InventoryClickEvent to XPboost v1.3
2:58:03 PM org.bukkit.event.EventException
2:58:03 PM 	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:03 PM 	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:03 PM 	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:03 PM 	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:03 PM 	at net.minecraft.server.v1_8_R2.PlayerConnection.a(PlayerConnection.java:1614) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:03 PM 	at net.minecraft.server.v1_8_R2.PacketPlayInWindowClick.a(SourceFile:31) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:04 PM 	at net.minecraft.server.v1_8_R2.PacketPlayInWindowClick.a(SourceFile:9) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:04 PM 	at net.minecraft.server.v1_8_R2.PlayerConnectionUtils$1.run(SourceFile:13) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:04 PM 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_66]
2:58:04 PM 	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_66]
2:58:04 PM 	at net.minecraft.server.v1_8_R2.SystemUtils.a(SourceFile:60) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:04 PM 	at net.minecraft.server.v1_8_R2.MinecraftServer.A(MinecraftServer.java:710) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:04 PM 	at net.minecraft.server.v1_8_R2.DedicatedServer.A(DedicatedServer.java:368) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:04 PM 	at net.minecraft.server.v1_8_R2.MinecraftServer.z(MinecraftServer.java:651) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:04 PM 	at net.minecraft.server.v1_8_R2.MinecraftServer.run(MinecraftServer.java:554) [spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:04 PM 	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_66]
2:58:04 PM Caused by: java.lang.NullPointerException
2:58:05 PM 	at com.dubcat.booster.xpbAPI.hasBoost(xpbAPI.java:25) ~[?:?]
2:58:05 PM 	at com.dubcat.booster.Main.onInventoryClick(Main.java:274) ~[?:?]
2:58:05 PM 	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_66]
2:58:05 PM 	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_66]
2:58:05 PM 	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_66]
2:58:05 PM 	at java.lang.reflect.Method.invoke(Method.java:497) ~[?:1.8.0_66]
2:58:05 PM 	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301) ~[spigot_server.jar:git-Spigot-2f787bd-ea28011]
2:58:05 PM 	... 15 more