Thread.run() has thrown a NullPointerException

We found this prefix in 5 webpages.
MapChildren (5)Typical messages (1)TraceDetailed Map
  1. java.lang.NullPointerException
    1.   at com.gmail.nossr50.mcMMO.onDisable()
    2.   at org.bukkit.plugin.java.JavaPlugin.setEnabled()
    3.   at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin()
    4.   at org.bukkit.plugin.SimplePluginManager.disablePlugin()
    5.   at com.gmail.nossr50.mcMMO.onEnable()
    6.   at org.bukkit.plugin.java.JavaPlugin.setEnabled()
    7.   at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin()
    8.   at org.bukkit.plugin.SimplePluginManager.enablePlugin()
    9.   at org.bukkit.craftbukkit.v1_9_R1.CraftServer.loadPlugin()
    10.   at org.bukkit.craftbukkit.v1_9_R1.CraftServer.enablePlugins()
    11.   at net.minecraft.server.v1_9_R1.DedicatedServer.init()
    12.   at net.minecraft.server.v1_9_R1.MinecraftServer.run()
    13.   at java.lang.Thread.run()
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MessageNumber of crashes
<No message>5
  1. java.lang.NullPointerException
    1.   at com.gmail.nossr50.mcMMO.onDisable()
    2.   at org.bukkit.plugin.java.JavaPlugin.setEnabled()
    3.   at org.bukkit.plugin.java.JavaPluginLoader.disablePlugin()
    4.   at org.bukkit.plugin.SimplePluginManager.disablePlugin()
    5.   at com.gmail.nossr50.mcMMO.onEnable()
    6.   at org.bukkit.plugin.java.JavaPlugin.setEnabled()
    7.   at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin()
    8.   at org.bukkit.plugin.SimplePluginManager.enablePlugin()
    9.   at org.bukkit.craftbukkit.v1_9_R1.CraftServer.loadPlugin()
    10.   at org.bukkit.craftbukkit.v1_9_R1.CraftServer.enablePlugins()
    11.   at net.minecraft.server.v1_9_R1.DedicatedServer.init()
    12.   at net.minecraft.server.v1_9_R1.MinecraftServer.run()
    13.   at java.lang.Thread.run()