Bukkit

[23:43:41] [Server thread/ERROR]: Could not pass event PrepareItemCraftEvent to ArmorSaddles v4.0
java.lang.NullPointerException
    at me.incomprehendable.dev.pwp.PerWorldPlugins.checkWorld(PerWorldPlugins.java:201) ~[?:?]
    at me.incomprehendable.dev.pwp.transparentlisteners.PWPRegisteredListener.callEvent(PWPRegisteredListener.java:24) ~[?:?]
    at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callPreCraftEvent(CraftEventFactory.java:744) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.CraftingManager.craft(CraftingManager.java:298) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.EntitySheep.a(EntitySheep.java:225) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.EntitySheep.b(EntitySheep.java:194) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.EntitySheep.createChild(EntitySheep.java:242) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.PathfinderGoalBreed.g(PathfinderGoalBreed.java:70) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.PathfinderGoalBreed.e(PathfinderGoalBreed.java:45) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.PathfinderGoalSelector.a(PathfinderGoalSelector.java:91) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.EntityInsentient.doTick(EntityInsentient.java:473) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.EntityLiving.m(EntityLiving.java:1626) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.EntityInsentient.m(EntityInsentient.java:338) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.EntityAgeable.m(EntityAgeable.java:139) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.EntityAnimal.m(EntityAnimal.java:23) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.EntitySheep.m(EntitySheep.java:63) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.EntityLiving.t_(EntityLiving.java:1487) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.EntityInsentient.t_(EntityInsentient.java:193) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.World.entityJoinedWorld(World.java:1607) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.World.g(World.java:1582) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.World.tickEntities(World.java:1425) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.WorldServer.tickEntities(WorldServer.java:597) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:786) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [custom.jar:git-Spigot-e4d4710-e1ebe52]
    at java.lang.Thread.run(Thread.java:745) [?:1.8.0_31]