java.lang.NullPointerException: Ticking entity
	at gregtechmod.common.tileentities.machines.multi.GT_MetaTileEntity_Grinder.getFluidAmount(GT_MetaTileEntity_Grinder.java:85)
	at gregtechmod.common.containers.GT_Container_Grinder.prepareChanges(GT_Container_Grinder.java:36)
	at gregtechmod.api.gui.GT_ContainerMetaTile_Machine.func_75142_b(GT_ContainerMetaTile_Machine.java:66)
	at net.minecraft.entity.player.EntityPlayerMP.func_70071_h_(EntityPlayerMP.java:317)
	at net.minecraft.world.World.func_72866_a(World.java:2740)
	at net.minecraft.world.WorldServer.func_72866_a(WorldServer.java:877)
	at net.minecraft.world.World.func_72870_g(World.java:2678)
	at net.minecraft.world.World.func_72939_s(World.java:2480)
	at net.minecraft.world.WorldServer.func_72939_s(WorldServer.java:673)
	at net.minecraft.server.MinecraftServer.func_71190_q(MinecraftServer.java:986)
	at net.minecraft.server.dedicated.DedicatedServer.func_71190_q(DedicatedServer.java:432)
	at net.minecraft.server.MinecraftServer.func_71217_p(MinecraftServer.java:841)
	at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:693)
	at java.lang.Thread.run(Unknown Source)