Spawner error with Spigot 1.8

[12:22:49] [Server thread/ERROR]: Could not pass event PlayerItemHeldEvent to Spawner v1.9b-b0
org.bukkit.event.EventException
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:305) ~[Spigot18.jar:git-Spigot-c46583f-e6f9fd4]
	at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[Spigot18.jar:git-Spigot-c46583f-e6f9fd4]
	at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [Spigot18.jar:git-Spigot-c46583f-e6f9fd4]
	at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [Spigot18.jar:git-Spigot-c46583f-e6f9fd4]
	at net.minecraft.server.v1_8_R1.PlayerConnection.a(PlayerConnection.java:884) [Spigot18.jar:git-Spigot-c46583f-e6f9fd4]
	at net.minecraft.server.v1_8_R1.PacketPlayInHeldItemSlot.a(SourceFile:30) [Spigot18.jar:git-Spigot-c46583f-e6f9fd4]
	at net.minecraft.server.v1_8_R1.PacketPlayInHeldItemSlot.a(SourceFile:8) [Spigot18.jar:git-Spigot-c46583f-e6f9fd4]
	at net.minecraft.server.v1_8_R1.PacketHandleTask.run(SourceFile:13) [Spigot18.jar:git-Spigot-c46583f-e6f9fd4]
	at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) [?:1.7.0_72]
	at java.util.concurrent.FutureTask.run(Unknown Source) [?:1.7.0_72]
	at net.minecraft.server.v1_8_R1.MinecraftServer.z(MinecraftServer.java:683) [Spigot18.jar:git-Spigot-c46583f-e6f9fd4]
	at net.minecraft.server.v1_8_R1.DedicatedServer.z(DedicatedServer.java:316) [Spigot18.jar:git-Spigot-c46583f-e6f9fd4]
	at net.minecraft.server.v1_8_R1.MinecraftServer.y(MinecraftServer.java:623) [Spigot18.jar:git-Spigot-c46583f-e6f9fd4]
	at net.minecraft.server.v1_8_R1.MinecraftServer.run(MinecraftServer.java:526) [Spigot18.jar:git-Spigot-c46583f-e6f9fd4]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_72]
Caused by: java.lang.NullPointerException
	at me.ryvix.spawner.SpawnerFunctions.getSpawnerName(SpawnerFunctions.java:228) ~[?:?]
	at me.ryvix.spawner.SpawnerFunctions.setSpawnerName(SpawnerFunctions.java:237) ~[?:?]
	at me.ryvix.spawner.SpawnerFunctions.resetSpawnerName(SpawnerFunctions.java:232) ~[?:?]
	at me.ryvix.spawner.SpawnerEvents.onPlayerItemHeld(SpawnerEvents.java:228) ~[?:?]
	at sun.reflect.GeneratedMethodAccessor140.invoke(Unknown Source) ~[?:?]
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[?:1.7.0_72]
	at java.lang.reflect.Method.invoke(Unknown Source) ~[?:1.7.0_72]
	at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:301) ~[Spigot18.jar:git-Spigot-c46583f-e6f9fd4]
	... 14 more