java.lang.NullPointerException: Ticking memory connection

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java.lang.NullPointerException: Ticking memory connection	at cpw.mods.fml.common.network.internal.FMLProxyPacket.func_148833_a(FMLProxyPacket.java:101)	at net.minecraft.network.NetworkManager.func_74428_b(NetworkManager.java:212)	at net.minecraft.network.NetworkSystem.func_151269_c(NetworkSystem.java:165)	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:659)	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:547)	at net.minecraft.server.integrated.IntegratedServer.func_71217_p(IntegratedServer.java:186)	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:396)	at net.minecraft.server.MinecraftServer$2.run(MinecraftServer.java:685)