19:18:39 [WARNING] [mcMMO] Task #2900 for mcMMO v1.4.07-dev1-b2127 generated an exception
java.lang.NullPointerException
        at com.gmail.nossr50.events.skills.McMMOPlayerSkillEvent.<init>(McMMOPlayerSkillEvent.java:20)
        at com.gmail.nossr50.events.skills.abilities.McMMOPlayerAbilityDeactivateEvent.<init>(McMMOPlayerAbilityDeactivateEvent.java:14)
        at com.gmail.nossr50.runnables.skills.AbilityDisableTask.run(AbilityDisableTask.java:50)
        at org.bukkit.craftbukkit.v1_6_R2.scheduler.CraftTask.run(CraftTask.java:58)
        at org.bukkit.craftbukkit.v1_6_R2.scheduler.CraftScheduler.mainThreadHeartbeat(CraftScheduler.java:345)
        at net.minecraft.server.v1_6_R2.MinecraftServer.t(MinecraftServer.java:518)
        at net.minecraft.server.v1_6_R2.DedicatedServer.t(DedicatedServer.java:239)
        at net.minecraft.server.v1_6_R2.MinecraftServer.s(MinecraftServer.java:481)
        at net.minecraft.server.v1_6_R2.MinecraftServer.run(MinecraftServer.java:413)
        at net.minecraft.server.v1_6_R2.ThreadServerApplication.run(SourceFile:582)