Sorry may be i post this topic on a wrong place QAQ
But I find this bug today(in 1.5.2) and it still exist in the latest build for 1.6.1!
Here is a part of crash report, I'm sure there's something wrong with the update() of the Compressor tile entity:
---- Minecraft Crash Report ----
// I just don't know what went wrong
Time: 13-7-7 下午4:48
Description: Ticking tile entity
java.lang.NullPointerException
at ic2.core.block.machine.tileentity.TileEntityCompressor.getValidPump(TileEntityCompressor.java:127)
at ic2.core.block.machine.tileentity.TileEntityCompressor.canOperate(TileEntityCompressor.java:77)
at ic2.core.block.machine.tileentity.TileEntityStandardMachine.func_70316_g(TileEntityStandardMachine.java:141)
at net.minecraft.world.World.func_72939_s(World.java:2207)