org.bukkit.event.EventException: This exception has no message.

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This exception has no message.
java.lang.NullPointerException:
at com.wasteofplastic.askyblock.commands.Challenges.hasRequired(Challenges.java:1205)
at com.wasteofplastic.askyblock.commands.Challenges.checkIfCanCompleteChallenge(Challenges.java:828)
at com.wasteofplastic.askyblock.commands.Challenges.onCommand(Challenges.java:198)
at org.bukkit.command.PluginCommand.execute(PluginCommand.java:45)
at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:143)
at org.bukkit.craftbukkit.v1_8_R3.CraftServer.dispatchCommand(CraftServer.java:666)
at org.bukkit.craftbukkit.v1_8_R3.entity.CraftPlayer.performCommand(CraftPlayer.java:339)
at com.wasteofplastic.askyblock.panels.ControlPanel.onInventoryClick(ControlPanel.java:278)
at sun.reflect.GeneratedMethodAccessor310.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at co.aikar.timings.TimedEventExecutor.execute(TimedEventExecutor.java:74)
at org.bukkit.plugin.RegisteredListener.callEvent(RegisteredListener.java:62)
at org.bukkit.plugin.SimplePluginManager.fireEvent(SimplePluginManager.java:501)
at org.bukkit.plugin.SimplePluginManager.callEvent(SimplePluginManager.java:486)
at net.minecraft.server.v1_8_R3.PlayerConnection.a(PlayerConnection.java:1662)
at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:31)
at net.minecraft.server.v1_8_R3.PacketPlayInWindowClick.a(SourceFile:9)
at net.minecraft.server.v1_8_R3.PlayerConnectionUtils$1.run(SourceFile:13)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at net.minecraft.server.v1_8_R3.SystemUtils.a(SourceFile:44)
at net.minecraft.server.v1_8_R3.MinecraftServer.B(MinecraftServer.java:774)
at net.minecraft.server.v1_8_R3.DedicatedServer.B(DedicatedServer.java:378)
at net.minecraft.server.v1_8_R3.MinecraftServer.A(MinecraftServer.java:713)
at net.minecraft.server.v1_8_R3.MinecraftServer.run(MinecraftServer.java:616)
at java.lang.Thread.run(Thread.java:745)

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