java.lang.NullPointerException: Ticking block entity

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java.lang.NullPointerException: Ticking block entity
at net.minecraft.server.management.UserListOps.func_152681_a(SourceFile:51)
at net.minecraft.server.management.UserListOps.func_152681_a(SourceFile:9)
at net.minecraft.server.management.UserList.func_152683_b(SourceFile:68)
at com.feed_the_beast.ftbl.util.FTBLib.isOP(FTBLib.java:318)
at com.feed_the_beast.ftbl.api.permissions.rankconfig.RankConfig.getJson(RankConfig.java:50)
at com.feed_the_beast.ftbu.handlers.FTBUPlayerEventHandler.onBlockBreak(FTBUPlayerEventHandler.java:297)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler_224_FTBUPlayerEventHandler_onBlockBreak_BreakEvent.invoke(.dynamic)
at net.minecraftforge.fml.common.eventhandler.ASMEventHandler.invoke(ASMEventHandler.java:49)
at net.minecraftforge.fml.common.eventhandler.EventBus.post(EventBus.java:140)
at lumien.randomthings.tileentity.TileEntityBlockBreaker.func_73660_a(TileEntityBlockBreaker.java:96)
at net.minecraft.world.World.func_72939_s(World.java:1797)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:707)
at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:385)
at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:611)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:469)
at java.lang.Thread.run(Thread.java:745)

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