Spawner 2.3 crash with Spigot 1.8.8

[01:34:47] [Server thread/INFO]: Spudington issued server command: /spawner give pig
[01:34:47] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'spawner' in plugin Spawner v2.3-5494d1d
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:141) ~[Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:640) ~[Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	at net.minecraft.server.v1_8_R3.PlayerConnection.handleCommand(PlayerConnection.java:1162) [Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:997) [Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:45) [Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	at net.minecraft.server.v1_8_R3.PacketPlayInChat.a(PacketPlayInChat.java:1) [Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13) [Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	at java.util.concurrent.Executors$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_R3.SystemUtils.a(SourceFile:44) [Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:714) [Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:653) [Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:556) [Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	at java.lang.Thread.run(Unknown Source) [?:1.7.0_72]
Caused by: java.lang.NullPointerException
	at me.ryvix.spawner.SpawnerFunctions.getSpawnerName(SpawnerFunctions.java:371) ~[?:?]
	at me.ryvix.spawner.SpawnerFunctions.getSpawnerName(SpawnerFunctions.java:332) ~[?:?]
	at me.ryvix.spawner.SpawnerFunctions.isValidEntity(SpawnerFunctions.java:90) ~[?:?]
	at me.ryvix.spawner.SpawnerCommands.onCommand(SpawnerCommands.java:210) ~[?:?]
	at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[Spigot188.jar:git-Spigot-6c9b0a1-de5c261]
	... 15 more