Also getting this exception rather frequently in the logs with #1006 :
03-02 18:05:40 [SEVERE] [TickThreading] Exception while updating block neighbours
java.lang.NullPointerException
at buildcraft.transport.BlockGenericPipe.a(BlockGenericPipe.java:352)
at yc.m(World.java:124)
at yc.h(World.java:802)
at dan200.computer.shared.NetworkedComputerHelper.update(NetworkedComputerHelper.java:122)
at dan200.turtle.shared.TileEntityTurtle.g(TileEntityTurtle.java:2350)
at me.nallar.tickthreading.minecraft.tickregion.TileEntityTickRegion.doTick(TileEntityTickRegion.java:99)
at me.nallar.tickthreading.minecraft.tickregion.TickRegion.run(TickRegion.java:42)
at me.nallar.tickthreading.minecraft.ThreadManager$2.run(ThreadManager.java:90)
at me.nallar.tickthreading.minecraft.ThreadManager$1.run(ThreadManager.java:41)
at me.nallar.tickthreading.minecraft.ThreadManager$ServerWorkThread.run(ThreadManager.java:157)
java.lang.NullPointerException
at buildcraft.transport.BlockGenericPipe.a(BlockGenericPipe.java:352)
at yc.m(World.java:124)
at yc.h(World.java:802)
at dan200.computer.shared.NetworkedComputerHelper.update(NetworkedComputerHelper.java:122)
at dan200.turtle.shared.TileEntityTurtle.g(TileEntityTurtle.java:2350)
at me.nallar.tickthreading.minecraft.tickregion.TileEntityTickRegion.doTick(TileEntityTickRegion.java:99)
at me.nallar.tickthreading.minecraft.tickregion.TickRegion.run(TickRegion.java:42)
at me.nallar.tickthreading.minecraft.ThreadManager$2.run(ThreadManager.java:90)
at me.nallar.tickthreading.minecraft.ThreadManager$1.run(ThreadManager.java:41)
at me.nallar.tickthreading.minecraft.ThreadManager$ServerWorkThread.run(ThreadManager.java:157)