com.google.common.util.concurrent.UncheckedExecutionException: java.lang.NullPointerException

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java.lang.NullPointerException
java.lang.NullPointerException:
at ninja.leaping.permissionsex.sponge.PEXSubjectCollection.(PEXSubjectCollection.java:60)
at ninja.leaping.permissionsex.sponge.PermissionsExPlugin$1.load(PermissionsExPlugin.java:112)
at ninja.leaping.permissionsex.sponge.PermissionsExPlugin$1.load(PermissionsExPlugin.java:109)
at com.google.common.cache.LocalCache$LoadingValueReference.loadFuture(LocalCache.java:3524)
at com.google.common.cache.LocalCache$Segment.loadSync(LocalCache.java:2317)
at com.google.common.cache.LocalCache$Segment.lockedGetOrLoad(LocalCache.java:2280)
at com.google.common.cache.LocalCache$Segment.get(LocalCache.java:2195)
at com.google.common.cache.LocalCache.get(LocalCache.java:3934)
at com.google.common.cache.LocalCache.getOrLoad(LocalCache.java:3938)
at ninja.leaping.permissionsex.sponge.PermissionsExPlugin.getUserSubjects(PermissionsExPlugin.java:295)
at ninja.leaping.permissionsex.sponge.PermissionsExPlugin.onPlayerQuit(PermissionsExPlugin.java:246)
at org.spongepowered.common.event.listener.DisconnectListener_PermissionsExPlugin_onPlayerQuit11.handle(Unknown Source)
at org.spongepowered.common.event.RegisteredListener.handle(RegisteredListener.java:95)
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:349)
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:332)
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:377)
at org.spongepowered.mod.event.SpongeModEventManager.post(SpongeModEventManager.java:362)
at org.spongepowered.common.SpongeImpl.postEvent(SpongeImpl.java:138)
at net.minecraft.network.NetHandlerPlayServer.onDisconnectHandler(NetHandlerPlayServer.java:613)
at net.minecraft.network.NetHandlerPlayServer.func_147231_a(NetHandlerPlayServer.java:802)
at net.minecraft.network.NetworkManager.func_179293_l(NetworkManager.java:455)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:732)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:387)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:613)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:471)
at java.lang.Thread.run(Thread.java:745)

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