Pastebin: http://pastebin.com/5puSNRLS

Game crashed when removing a Mana Pool bound to a Red Stringed Comparator. Comparator was removed first and still seems to reference the spot the pool was at when I removed the pool, pointing the Comparator to an invalid block ID.

It actually points to an air block.

I'm guessing there should be a check if the block is broken? This might happen with other Red String things

My thoughts as well. Would do more testing but my rig is so damn slow, takes 15 min to open vanilla + Botania on lowest settings possible.