When i place an ore acidizer its just an invisible block when i left click it dissapears. But when i somehow place 2 of them down on a same block my game crashes and when i open the world again the ore acidizer is spawned in but the invisible one is still in the front of it. I dont know which settings i need to change.
log link: https://securelogger.net/files/aa6fcffa-337d-48ef-8891-93ca1e1a3d6b.txt

Current mod version is:1.0.27_X5036 (but it has been a problem in the older versions as well)

java.lang.NullPointerException: Unexpected error
	at com.tierzero.stacksonstacks.block.BlockPile.getPickBlock(BlockPile.java:159)
	at net.minecraft.block.Block.getPickBlock(Block.java:1796)
	at codechicken.nei.api.ItemInfo.getIdentifierItems(ItemInfo.java:492)
	at codechicken.nei.HUDRenderer.renderOverlay(HUDRenderer.java:42)

Looks like "stacksonstacks" is involved here, not sure what's causing that and I haven't seen this issue pop up anywhere else, does it happen when you remove that mod?

Yeah removing the mod fixed it.