[08:40:11 ERROR]: Could not pass event CreatureSpawnEvent to uSkyBlock v2.7.2
org.bukkit.event.EventException
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:310) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:502) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:487) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.craftbukkit.v1_8_R3.event.CraftEventFactory.callCreatureSpawnEvent(CraftEventFactory.java:277) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.World.addEntity(World.java:1015) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at de.Keyle.MyPet.compat.v1_8_R3.entity.EntityRegistry.spawnMinecraftEntity(EntityRegistry.java:108) [MyPet-2.2.9.jar:?]
        at de.Keyle.MyPet.entity.MyPet.createEntity(MyPet.java:513) [MyPet-2.2.9.jar:?]
        at de.Keyle.MyPet.entity.MyPet.respawnPet(MyPet.java:561) [MyPet-2.2.9.jar:?]
        at de.Keyle.MyPet.entity.MyPet.schedule(MyPet.java:605) [MyPet-2.2.9.jar:?]
        at de.Keyle.MyPet.api.util.Timer$1.run(Timer.java:53) [MyPet-2.2.9.jar:?]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftTask.run(CraftTask.java:71) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at org.bukkit.craftbukkit.v1_8_R3.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:350) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:723) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:374) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:654) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:557) [spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        at java.lang.Thread.run(Thread.java:745) [?:1.8.0_112]
Caused by: java.lang.NullPointerException
        at us.talabrek.ultimateskyblock.event.SpawnEvents.checkLimits(SpawnEvents.java:163) ~[?:?]
        at us.talabrek.ultimateskyblock.event.SpawnEvents.onCreatureSpawn(SpawnEvents.java:135) ~[?:?]
        at sun.reflect.GeneratedMethodAccessor191.invoke(Unknown Source) ~[?:?]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_112]
        at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_112]
        at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:306) ~[spigot-1.8.8.jar:git-Spigot-21fe707-e1ebe52]
        ... 17 more