java.lang.NullPointerException: Ticking block entity

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java.lang.NullPointerException: Ticking block entity
at mcjty.rftools.blocks.teleporter.MatterTransmitterTileEntity.isPlayerOutsideBeam(MatterTransmitterTileEntity.java:537)
at mcjty.rftools.blocks.teleporter.MatterTransmitterTileEntity.checkStateServer(MatterTransmitterTileEntity.java:345)
at mcjty.rftools.blocks.teleporter.MatterTransmitterTileEntity.func_73660_a(MatterTransmitterTileEntity.java:308)
at net.minecraft.world.World.func_72939_s(World.java:1802)
at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:709)
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(Unknown Source)

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