RainbowArmourError

Could not pass event InventoryClickEvent to RainbowArmour v1.6.7
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1633) [paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31) [paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9) [paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [?:1.8.0_31]
	at java.util.concurrent.FutureTask.run(FutureTask.java:266) [?:1.8.0_31]
	at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44) [paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:772) [paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378) [paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:711) [paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:614) [paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	at java.lang.Thread.run(Thread.java:745) [?:1.8.0_31]
Caused by: java.lang.NullPointerException
	at com.xtechgamer735.RainbowArmour.Listeners.LockArmour.cancelClick(LockArmour.java:34) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor288.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_31]
	at java.lang.reflect.Method.invoke(Method.java:483) ~[?:1.8.0_31]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[paperspigot-1.8.8.jar:git-PaperSpigot-a55011e-d3e0b6f]
	... 15 more