> [17:59:33 ERROR]: Could not pass event SpawnerSpawnEvent to SpawnerUpgrades v1.0
org.bukkit.event.EventException
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:309) ~[StellarSpigot.jar:git-TacoSpigot-04511af6]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) ~[StellarSpigot.jar:git-TacoSpigot-04511af6]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[StellarSpigot.jar:git-TacoSpigot-04511af6]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:508) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:493) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at com.bgsoftware.wildstacker.listeners.SpawnersListener.onSpawnerSpawn(SpawnersListener.java:340) [WildStacker-3-Pre4.jar:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_212]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_212]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_212]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_212]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:307) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:78) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:508) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:493) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callSpawnerSpawnEvent(CraftEventFactory.java:176) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.MobSpawnerAbstract.a(MobSpawnerAbstract.java:246) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.MobSpawnerAbstract.c(MobSpawnerAbstract.java:156) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.TileEntityMobSpawner.c(SourceFile:55) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.World.tickEntities(World.java:2179) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.WorldServer.tickEntities(WorldServer.java:607) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:881) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:821) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:748) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:649) [StellarSpigot.jar:git-TacoSpigot-04511af6]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_212]
Caused by: java.lang.NullPointerException: Name is null
at java.lang.Enum.valueOf(Enum.java:236) ~[?:1.8.0_212]
at org.bukkit.Material.valueOf(Material.java:1) ~[StellarSpigot.jar:git-TacoSpigot-04511af6]
at hassan.plugin.com.Main.getItemFromLevel(Main.java:136) ~[?:?]
at hassan.plugin.com.events.SpawnerEvents.spawnerSpawnEvent(SpawnerEvents.java:58) ~[?:?]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_212]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_212]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_212]
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_212]
at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:307) ~[StellarSpigot.jar:git-TacoSpigot-04511af6]
... 25 more