Every time I place a cable from Mekanism or RefinedStorage in a already placed Multiblock structure (build with chisel and bits) it crashes with a Nullpointer.
After the crash the block is places like it should. (<- only Mekanism, RS behavior is below)

Crashlog + a few more lines above it

EDIT: I don't know if this is related to RefinedStorage, but placing any bit on a block where a cable is generates an invisible bug block. (This is happening on a server)
/testfor outputs tile.name.null
This is only happening with RS cables, not with Mekanism cables/pipes/etc

Does it still crash without WAILA? Looks like its selection tooltip renderer is causing it. Will look into it tomorrow, probably

This bug is for 1.11.2 btw. Would be helpful if the bugreporter stated that.

It doesn't crash for me, but there is definitely some weird bugs (for example, this error and a LOT of invisible blocks) in there that my changes in the 1.12 branch probably fixed. I'll see if I can port them to this branch, shouldn't be too difficult to do

Fixed with #121.