If you put a fluid provider on an ic2 machine that has fluid it crashes.
if(((IFluidHandler)pair.getValue1()).canDrain(pair.getValue2().getOpposite(), liquid.getFluid())) { on line 265 in PipeFluidProvider.java

java.lang.NullPointerException: Ticking block entity
at ic2.core.block.machine.tileentity.TileEntityCondenser.canDrain(TileEntityCondenser.java:237)
at logisticspipes.pipes.PipeFluidProvider.getSpecificInterests(PipeFluidProvider.java:265)
at logisticspipes.routing.ServerRouter.updateInterests(ServerRouter.java:996)
at logisticspipes.routing.ServerRouter.update(ServerRouter.java:871)

This is definitly an IC2 bug. Did you report it to them?

I've reported it now, we'll see what happens.

This bug has been fixed over on the ic2 side. Now instead of null it returns false if there is a null detected. version ic2-exp 648