Unsure if anything else will cause it but, when I try to put stone bricks into a normal chisel's slot the game locks up.
Running forge 1.8.9 11.15.0.1718
Chisel 1.8.9 0.0.2.6
[21:37:12] [Client thread/INFO] [Chisel]: There are 97 slots but list is 97
[21:37:13] [Client thread/INFO] [Chisel]: Slot clicked is 90 and slot length is 97
[21:37:13] [Client thread/INFO] [Chisel]: Slot is net.minecraft.inventory.Slot@456952db
[21:37:14] [Client thread/INFO] [Chisel]: Slot clicked is 60 and slot length is 97
[21:37:14] [Client thread/INFO] [Chisel]: Slot is team.chisel.common.inventory.SlotChiselInput@7a2a6c28
that's what appears in the console as soon as I click it.